m mm . ' ' &M&'.' ?^'f i Sfe fflBH JAMES K.MOFFITT PAULINE FORE MOFFITT LIBRARY UNIVERSITY OF CALIFORNIA GENERAL LIBRARY, BERKELEY University of California Berkeley i THE ANTIQUITY OF MAN BY THE SAME AUTHOR. PRINCIPLES of GEOLOG-Y ; or, the MODERN CHANGES of the EAETH and its INHABITANTS, as illustrative of Geology. 9th Edition. Woodcuts, 8vo., 18s. ELEMENTS of GEOLOGY ; or, the ANCIENT CHANGES of the EABTH and its INHABITANTS, as illustrated by its Geological Monuments. 6th Edition, revised. Woodcuts. 8vo. \In preparation. A FIRST and SECOND VISIT to NORTH AMERICA, CANADA, NOVA SCOTIA, &c. : with GEOLOGICAL OBSERVATIONS. 2nd Edition. Maps. 4 vols. Post 8vo. 24. di 3 3 *s *-! 5 M ? * a 5 M f-4 > a 1 h* fi THE GEOLOGICAL EVIDENCES OF THE ANTIQUITY OF MAN WITH KEMABKS ON THEORIES OF THE ORIGIN OF SPECIES BY VARIATION BY Sffi CHAELES LYELL, F.E.S. AUTHOR OF 'PRINCIPLES OP GEOLOGY,' 'ELEMENTS OF GEOLOGY,' ETC. ETC. ILLUSTRATED BY WOODCUTS LONDON JOHN MUEEAY, ALBEMARLE STREET 1863 The right or translation is reserved LONDON PBINTEU BY SPOTTISWOODE AND CO. NEW-STKEET SQUABB CONTENTS. CHAPTER I. INTRODUCTION. Preliminary Remarks on the Subjects treated of in this "Work Definition of the Terms Recent, Post-Pliocene, and Post-Tertiary Tabular View of the entire Series of Fossiliferous Strata ,-/.<* . . . PAGE 1 CHAPTER II. RECENT PERIOD DANISH PEAT AND SHELL MOUNDS SWISS LAKE DWELLINGS. Works of Art in Danish Peat-Mosses Remains of three Periods of Vegetation in the Peat Ages of Stone, Bronze, and Iron Shell-Mounds or ancient Refuse-Heaps of the Danish Islands Change in geographical Distribution of Marine Mollusca since their Origin Embedded Remains of Mammalia of recent Species Human Skulls of the same Period Swiss LaEe-Dwel- lings built on Piles Stone and Bronze Implements found in them Fossil Cereals and other Plants Remains of Mammalia, wild and domesticated No extinct Species Chronological Computations of the Date of the Bronze and Stone Periods in Switzerland Lake-Dwellings, or artificial Islands called ' Crannoges,' in Ireland ./->.. . ' v '. 8 CHAPTER III. FOSSIL HUMAN REMAINS AND WORKS OF ART OF THE RECENT PERIOD. Delta and Alluvial Plain of the Nile Burnt Bricks in Egypt before the Roman Era Borings in 1851-54 Ancient Mounds of the Valley of the Ohio Their Antiquity Sepulchral Mound at Santos in Brazil Delta of the Mississippi Ancient Human Remains in Coral Reefs of Florida Changes in Physical Geography in the Human Period Buried Canoes in marine Strata near Glasgow Upheaval since the Roman Occupation of the Shores of the Firth of Forth Fossil Whales near Stirling Upraised marine Strata of Sweden on Shores of the Baltic and the Ocean Attempts to compute their Age. v 33 yi CONTEXTS. CHAPTER IV. POST-PLIOCENE PERIOD BONES OF MAN AND EXTINCT MAMMALIA IN BELGIAN CAVERNS. Earliest Discoveries in Caves of Languedoc of Human Remains with Bones of extinct Mammalia Researches in 1833 of Dr. Schmerling in the Liege Caverns Scattered Portions of Human Skeletons associated with Bones of Elephant and Rhinoceros Distribution and probable Mode of Introduction of the Bones Implements of Flint and Bone Schmerling' s Conclusions as to the Antiquity of Man ignored Present State of the Belgian Caves Human Bones recently found in Cave of Engihoul Engulfed Rivers Stalagmitic Crust Antiquity of the Human Remains in Belgium how proved PAGE 59 CHAPTER V. POST-PLIOCENE PERIOD FOSSIL HUMAN SKULLS OF THE NEANDERTHAL AND ENGIS CAVES. Human Skeleton found in Cave near Diisseldorf Its geological Position and probable Age Its abnormal and ape-like Characters Fossil Human Skull of the Engis Cave near Liege Professor Huxley's Description of these Skulls Comparison of each, with extreme Varieties of the native Austra lian Race Range of Capacity in the Human and Simian Brains Skull from Borrebyin Denmark Conclusions of Professor Huxley Bearing of the peculiar Characters of the Neanderthal Skull on the Hypothesis of Transmu tation 75 CHAPTER VI. POST-PLIOCENE ALLUVIUM AND CAVE DEPOSITS WITH FLINT IMPLEMENTS. General Position of Drift with extinct Mammalia in Valleys Discoveries of M. Boucher de Perthes- at Abbeville Flint Implements found also at St. Acheul, near Amiens Curiosity awakened by the systematic Explora tion of the Brixham Cave Flint Knives in same, with Bones of extinct Mammalia Superposition of Deposits in the Cave Visits of English and French Geologists to Abbeville and Amiens . . . . 93 CHAPTER VII. PEAT AND POST-PLIOCENE ALLUVIUM OF THE VALLEY OF THE SOMME. Geological Structure of the Valley of the Somme and of the surrounding Country Position of Alluvium of different Ages Peat near Abbeville Its animal and vegetable Contents Works of Art in Peat Probable Antiquity of the Peat, and Changes of Level since its Growth began Flint Implements of antique Type in older Alluvium Their various Forms and great Numbers i . 106 CONTENTS. CHAPTER VIII. POST-PLIOCENE ALLUVIUM WITH FLINT IMPLEMENTS OF THE VALLEY OF THE SOMME concluded. Fluvio-marine Strata, with Flint Implements, near Abbeville Marine Shells in same Cyrena Fluminalis Mammalia Entire Skeleton of Rhinoceros Flint Implements, why found low down in Fluviatile Deposits Rivers shifting their Channels Relative Ages of higher and lower-level Gravels Section of Alluvium of St. Acheul Two Species of Elephant and Hippopo tamus coexisting with Man in France Volume of Drift, proving Antiquity of Flint Implements Absence of Human Bones in tool-bearing Alluvium, how explained Value of certain Kinds of negative Evidence tested thereby Human Bones not found in drained Lake of Haarlem . . PAGE 121 CHAPTER IK WORKS OF ART IN POST-PLIOCENE ALLUVIUM OF FEANCE AND ENGLAND. Flint Implements in ancient Alluvium of the Basin of the Seine Bones of Man and of extinct Mammalia in the Cave of Arcy Extinct Mammalia in the Valley of the Oise Flint Implement in Gravel of same Valley Works of Art in Post-Pliocene Drift in Valley of the Thames Musk Buffalo Meeting of northern and southern Fauna Migrations of Quadrupeds Mammals of Amoor Land Chronological Relation of the older Alluvium of the Thames to the Glacial Drift Flint Implements of Post-Pliocene Period in Surrey, Middlesex, Kent, Bedfordshire, and Suffolk. . ', ' . 150 CHAPTER X. CAVERN DEPOSITS, AND PLACE OF SEPULTURE OF THE POST-PLIOCENE PERIOD. Flint Implements in Cave containing Hysena and other extinct Mammalia in Somersetshire Caves of the Gower Peninsula in South Wales Rhinoceros hemitoechus Ossiferous Caves near Palermo Sicily once part of Africa Rise of Bed of the Mediterranean to the Height of three hundred Feet in the Human Period in Sardinia Burial Place of Post-Pliocene Date of Aurignac in the South of France Rhinoceros tichorhinus eaten by Man M. Lartet on extinct Mammalia and Works of Art found in the Aurignac Cave Relative Antiquity of the same, considered 170 Vlll CONTENTS. CHAPTER XI. AGE OF HUMAN FOSSILS OF LE PUT IN CENTRAL FRANCE AND OF NATCHEZ ON THE MISSISSIPPI, DISCUSSED. Question as to the Authenticity of the Fossil Man of Denise, near Le Puy-en- Velay, considered Antiquity of the Human Race implied by that Fossil Successive Periods of volcanic Action in Central France "With what Changes in the Mammalian Fauna they correspond The Elephas Meridio- nalis anterior in Time to the implement-bearing Gravel of St. Acheul Authenticity of the Human Fossil of Natchez on the Mississippi, discussed The Natchez Deposit, containing Bones of Mastodon and Megalonyx, pro bably not older than the Flint Implements of St. Acheul . . PAGE 194 CHAPTER XII. ANTIQUITY OF MAN RELATIVELY TO THE GLACIAL PERIOD AND TO THE EXISTING FAUNA AND FLORA. Chronological Relation of the Glacial Period, and the earliest known Signs of Man's Appearance in Europe Series of Tertiary Deposits in Norfolk and Suffolk immediately antecedent to the Glacial Period Gradual Refrigeration of Climate proved by the Marine Shells of successive Groups Marine Newer Pliocene Shells of northern Character, near Woodbridge Section of tbe Norfolk Cliffs Norwich Crag Forest Bed and fluvio-marine Strata Fossil Plants and Mammalia of the same Overlying Boulder Clay and contorted Drift Newer freshwater Formation of Mundesley compared to that of Hoxne Great Oscillations of Level implied by the Series of Strata in the Norfolk Cliffs Earliest known Date of Man long subsequent to the existing Fauna and Flora 206 CHAPTER XIII. CHRONOLOGICAL RELATIONS OF THE GLACIAL PERIOD AND THE EARLIEST SIGNS OF MAN'S APPEARANCE IN EUROPE. Chronological Relations of the Close of the Glacial Period and the earliest geological Signs of the Appearance of Man Effects of Glaciers and Icebergs in polishing and scoring Rocks Scandinavia once encrusted with Ice like Greenland Outward Movement of Continental Ice in Greenland Mild Climate of Greenland in the Miocene Period Erratics of recent Period in Sweden Glacial State of Sweden in the Post-Pliocene Period Scotland formerly encrusted with Ice Its subsequent Submergence and Re-elevation Latest Changes produced by Glaciers in Scotland Remains of the Mammoth and Reindeer in Scotch Boulder Clay Parallel Roads of Glen Roy formed in Glacier Lakes Comparatively modern Date of these Shelves . 229 CONTENTS. IX CHAPTEE XIV. CHRONOLOGICAL RELATIONS OF THE GLACIAL PERIOD AND THE EARLIEST SIGNS OF MAN'S APPEARANCE IN EUROPE continued. Signs of extinct Glaciers in Wales Great Submergence of Wales during the Glacial Period proved by Marine Shells Still greater Depression inferred from stratified Drift Scarcity of organic Eemains in Glacial Formations Signs of extinct . Glaciers in England Ice Action in Ireland Maps illustrating successive Eevolutions in Physical Geography during the Post- Pliocene Period Southernmost Extent of Erratics in England Successive Periods of Junction and Separation of England, Ireland, and the Continent Time required for these Changes Probable Causes of the Upheaval and Subsidence of the Earth's Crust Antiquity of Man considered in relation to the Age of the existing Fauna and Flora .... PAGE 265 CHAPTEE XV. EXTINCT GLACIERS OF THE ALPS AND THEIR CHRONOLOGICAL RELATION TO THE HUMAN PERIOD. Extinct Glaciers of Switzerland Alpine Erratic Blocks on the Jura Not transported by floating Ice Extinct Glaciers of the Italian Side of the Alps Theory of the Origin of Lake-Basins by the erosive Action of Glaciers, considered Successive Phases in the Development of Glacial Action in the Alps Probable Eelation of these to the earliest known Date of Man Correspondence of the same with successive Changes in the Glacial Condition of the Scandinavian and British Mountains Cold Period in Sicily and Syria . .-_ . : . . , ,- . 4 V. ... 290 CHAPTEE XVI. HUMAN REMAINS IN THE LOESS, AND THEIR PROBABLE AGE. Nature, Origin, and Age of the Loess of the Ehine and Danube Impalpable Mud produced by the grinding Action of Glaciers Dispersion of this Mud at the Period of the Eetreat of the great Alpine Glaciers Continuity of the Loess from Switzerland to the Low Countries Characteristic organic Eemains not Lacustrine Alpine Gravel in the Valley of the Ehine covered by Loess Geographical Distribution of the Loess and its Height above the Sea Fossil Mammalia Loess of the Danube Oscillations in the Level of the Alps and lower Country required to explain the Formation and Denudation of the Loess More rapid Movement of the inland Country The same Depression and Upheaval might account for the Advance and Eetreat of the Alpine Glaciers Himalayan Mud of the Plains of the Ganges compared to European Loess Human Eemains in Loess near Maestricht, and their probable Antiquity 324 X CONTENTS. CHAPTER XVII. POST-GLACIAL DISLOCATIONS AND FOLDINGS OF CRETACEOUS AND DRIFT STRATA IN THE ISLAND OF MOEN, IN DENMARK. Geological Structure of the Island of Moen Great Disturbances of the Chalk posterior in Date to the Glacial Drift, with recent Shells M. Pug- gaard's Sections of the Cliffs of Moen Flexures and Faults common to the Chalk and Glacial Drift Different Direction of the Lines of successive Movement, Fracture, and Flexure Undisturbed Condition of the Eocks in the adjoining Danish Islands Unequal Movements of Upheaval in Finmark Earthquake of New Zealand in 1855 Predominance in all Ages of uniform Continental Movements over those by which the Eocks are locally convulsed . . . <" * .;' . - ' PAGE 341 CHAPTEE XVIII. THE GLACIAL PERIOD IN NORTH AMERICA. Post-glacial Strata containing Eemains of Mastodon Giganteus in North America Scarcity of Marine Shells in Glacial Drift of Canada and the United States Greater southern Extension of Ice- action in North America than in Europe Trains of Erratic Blocks of vast Size in Berkshire, Massa chusetts Description of their Linear Arrangement and Points of Departure Their Transportation referred to Floating and Coast Ice General Remarks on the Causes of former Changes of Climate at successive geological Epochs Supposed Effects of the Diversion of the Gulf Stream in a Northerly instead of North-Easterly Direction Development of extreme Cold on the opposite Sides of the Atlantic in the Glacial Period not strictly simultaneous Number of Species of Plants and Animals common to Pre- glacial and Post-glacial Times 351 CHAPTEE XIX. RECAPITULATION OF GEOLOGICAL PROOFS OF MAN'S ANTIQUITY. Recapitulation of Eesults arrived at in the earlier Chapters Ages of Stone and Bronze Danish Peat and Kitchen-Middens Swiss Lake-Dwellings Local Changes in Vegetation and in the wild and domesticated Animals and in Physical Geography coeval with the Age of Bronze and the later Stone Period Estimates of the positive Date of some Deposits of the later Stone Period Ancient Division of the Age of Stone of St. Acheul and Aurignac Migrations of Man in that Period from the Continent to England in Post- Glacial Times Slow Rate of Progress in barbarous Ages Doctrine of the superior Intelligence and Endowments of the original Stock of Mankind considered Opinions of the Greeks and Eomans, and their Coincidence with those of the modern Progressionist Early Egyptian Civilisation and its Date in comparison with that .of the First and Second Stone Periods CONTENTS. XI CHAPTER XX. THEORIES OF PROGRESSION AND TRANSMUTATION. Antiquity and Persistency in Character of the existing Races of Mankind Theory of their Unity of Origin considered Bearing of the Diversity of Races on the Doctrine of Transmutation Difficulty of defining the Terms 'Species' and 'Race' Lamarck's Introduction of the Element of Time into the Definition of a Species His Theory of Variation and Progression Objections to his Theory, how far answered Arguments of modern Writers in favour of Progression in the Animal and Vegetable World The old Landmarks supposed to indicate the first Appearance of Man, and of dif ferent Classes of Animals, found to be erroneous Yet the Theory of an advancing Series of organic Beings not inconsistent with Facts Earliest known Fossil Mammalia of low Grade No Vertebrata as yet discovered in the oldest fossiliferous Rocks Objections to the Theory of Progression considered Causes of the Popularity of the Doctrine of Progression as compared to that of Transmutation PAGE 385 CHAPTER XXI. ON THE ORIGIN OF SPECIES BY VARIATION AND NATURAL SELECTION. Mr. Darwin's Theory of the Origin of Species by Natural Selection Memoir by Mr. Wallace Manner in which favoured Races prevail in the Struggle for Existence Formation of new Races by breeding Hypothesis of definite and indefinite Modifiability equally arbitrary Competition and Extinction of Races Progression not a necessary Accompaniment of Variation Distinct Classes of Phenomena which natural Selection explains Unity of Type, rudimentary Organs, Geographical Distribution, Relation of the extinct to the living Fauna and Flora, and mutual Relations of suc cessive Groups of Fossil Forms Light thrown on Embryological Develop ment by natural Selection Why large Genera have more variable Species than small ones Dr. Hooker on the Evidence afforded by the Vegetable Kingdom in favour of Creation by Variation Sefstrom on alternate Gene ration How far the Doctrine of independent Creation is opposed to the Laws now governing the Migration of Species 407 CHAPTER. XXII. OBJECTIONS TO THE HYPOTHESIS OF TRANSMUTATION CONSIDERED. Statement of Objections to the Hypothesis of Transmutation founded on the Absence of intermediate Forms Genera of which the Species are closely allied Occasional Discovery of the missing Links in a Fossil State Davidson's Monograph on the Brachiopoda Why the Gradational Forms, when found, are not accepted as Evidence of Transmutation Gaps caused by Extinction of Races and Species Vast Tertiary Periods during which this Extinction has been going on in the Fauna and Flora now existing Xli CONTENTS. Genealogical Bond between Miocene and recent Plants and Insects Fossils of Oeninghen Species of Insects in Britain and North America represented by distinct Varieties Falconer's Monograph on living and fossil Elephants Fossil Species and Genera of the Horse Tribe in North and South America Eelation of the Pliocene Mammalia of North America, Asia, and Europe Species of Mammalia, though less persistent than the Mollusca, change slowly Arguments for and against Transmutation derived from the Absence of Mammalia in Islands Imperfection of the Geological Eecord Inter calation of newly discovered Formations of intermediate Age in the chronolo gical Series Eeference of the St. Cassian Beds to the Triassic Period Discovery of new organic Types Feathered Archseopteryx of the Oolite PAGE 424 CHAPTEE XXIII. ORIGIN AND DEVELOPMENT OF LANGUAGES AND SPECIES COMPARED. Aryan Hypothesis and Controversy The Eaces of Mankind change more slowly than their Languages Theory of the gradual Origin of Languages Difficulty of defining what is meant by a Language as distinct from a Dialect Great Number of extinct and living Tongues No European Language a Thousand Years old Gaps between Languages, how caused Imperfection of the Eecord Changes always in Progress Struggle for Existence between Eival Terms and Dialects Causes of Selection Each Language formed slowly in a single geographical Area May die out gradually or suddenly Once lost can never be revived Mode of Origin of Languages and Species a Mystery Speculations as to the Number of original Languages or Species unprofitable 454 CHAPTEE XXIV. BEARING OF THE DOCTRINE OF TRANSMUTATION ON THE ORIGIN OF MAN, AND HIS PLACE IN THE CREATION. Whether Man can be regarded as an Exception to the Eule if the Doctrine of Transmutation be embraced for the rest of the Animal Kingdom Zoological Eelations of Man to other Mammalia Systems of Classification Term Quadrumanous, why deceptive Whether the Structure of the Human Brain entitles Man to form a distinct Sub-class of the Mammalia Eecent Con troversy as to the Degree of Eesemblance between the Brain of Man and that of the Apes Intelligence of the lower Animals compared to the Intellect and Eeason of Man Grounds on which Man has been referred to a distinct Kingdom of Nature Immaterial Principle common to Man and Animals Non-discovery of intermediate Links among Fossil Anthropo morphous Species Hallam on the compound Nature of Man, and his Place in the Creation Dr. Asa Gray on Gradations in Nature, and on the bearing of the Doctrine of Natural Selection on Natural Theology . , . 471 GEOLOGICAL EVIDENCE OF THE ANTIQUITY OF MAN, CHAPTEE I. INTRODUCTOKY. PRELIMINARY REMARKS ON THE SUBJECTS TREATED OF IN THIS WORK DEFINITION OF THE TERMS RECENT, POST-PLIOCENE, AND POST-TER TIARY TABULAR VIEW OF THE ENTIRE SERIES OF FOSS1LLFEROUS STRATA. NO subject has lately excited more curiosity and general interest among geologists and the public than the question of the Antiquity of the Human Eace, whether or no we have sufficient evidence in caves, or in the superficial deposits commonly called drift or ' diluvium,' to prove the former co-existence of man with certain extinct mammalia. For the last half-century, the occasional occurrence, in va rious parts of Europe, of the bones of man or the works of his hands, in cave-breccias and stalactites, associated with the remains of the extinct hyaena, bear, elephant, or rhinoceros, has given rise to a suspicion that the date of man must be carried further back than we had heretofore imagined. On the other hand, extreme reluctance was naturally felt, on the part of scientific reasoners, to admit the validity of such 2 PRELIMINARY -REMARKS. CHAP. I. evidence, seeing that so many caves have been inhabited by a succession of tenants, and have been selected by man, as a place not only of domicile, but of sepulture, while some caves have also served as the channels through which the waters of occasional land-floods or engulfed rivers have flowed, so that the remains of living beings which have peopled the district at more than one era may have subse quently been mingled in such caverns and confounded together in one and the same deposit. But the facts brought to light in 1858, during the systematic investigation of the Brixham cave, near Torquay in Devonshire, which will be described in the sequel, excited anew the curiosity of the British public, and prepared the way for a general admission that scepticism in regard to the bearing of cave evidence in favour of the antiquity of man had previously been pushed to an extreme. Since that period, many of the facts formerly adduced in favour of the co-existence in ancient times of man with certain species of mammalia long since extinct have been re-examined in England and on the Continent, and new cases bearing on the same question, whether relating to caves or to alluvial strata in valleys, have been brought to light. To qualify myself for the appreciation and discussion of these cases, I have visited, in the course of the last three years, many parts of England, France, and Belgium, and have communicated personally or by letter with not a few of the geologists, English and foreign, who have taken part in these researches. Besides explaining in the present volume the results of this enquiry, I shall give a description of the glacial formations of Europe and North America, that I may allude to the theories entertained respecting their origin, and consider their probable relations in a chronological point of view to the human epoch, and why throughout' a great part of the northern hemisphere they so often interpose an abrupt CHAP. I, SUBJECTS TREATED OF IN THIS WORK. 3 barrier to all attempts to trace farther back into the past the signs of the existence of man upon the earth. In the concluding chapters I shall offer a few remarks on the, recent modifications of the Lamarckian theory of pro gressive development and transmutation, which are sug gested by Mr. Darwin's work on the ' Origin of Species, by Variation and Natural Selection,' and the bearing of this hypothesis on the different races of mankind and their con nection with other parts of the animal kingdom. Nomenclature. Some preliminary explanation of the nomenclature adopted in the following pages will be indis pensable, that the meaning attached to the terms Recent, Post-pliocene, and Post-tertiary may be correctly understood. Previously to the year 1833, when I published the third volume of the f Principles of Geology,' the strata called Tertiary had been divided by geologists into Lower, Middle, and Upper ; the Lower comprising the oldest formations of the environs of Paris and London, with others of like age ; the Middle, those of Bordeaux and Touraine ; and the Upper, all that lay above or were newer than the last-mentioned, group. When engaged, in 1828, in preparing for the press the treatise on geology above alluded to, I conceived the idea of classing the whole of this series of strata according to the different degrees of affinity which their fossil testacea bore to the living fauna. Having obtained information on this subject during my travels on the Continent, I learnt that M.Deshayes of Paris, already celebrated as a conchologist, had been led independently, by the study of a large collection of recent and fossil shells, to very similar views respecting the possibility of arranging the tertiary formations in chrono logical order, according to the proportional number of species of shells identical with living ones, which characterised each of the successive groups above mentioned. After comparing 3000 fossil species with 5000 living ones, the result arrived at B 2 4 DEFINITION OF THE TERMS CHAP. I. was, that in the lower tertiary strata, there were about 3|- per cent, identical with recent ; in the middle tertiary (the faluns of the Loire and Gironde), about 17 per cent. ; and in the upper tertiary, from 35 to 50, and sometimes in the most modern beds as much as 90 to 95 per cent. For the sake of clearness and brevity, I proposed to give short technical names to these sets of strata, or the periods to which they respec tively belonged. I called the first or oldest of them Eocene, the second Miocene, and the third Pliocene. The first of the above terms, Eocene, is derived from r)cu$ eos 9 dawn, and xottvos kainos, recent; because an extremely small propor tion of the fossil shells of this period could be referred to living species, so that this era seemed to indicate the dawn of the present testaceous fauna, no living species of shells having been detected in the antecedent or secondary rocks. Some conchologists are now unwilling to allow that any Eocene species of shell has really survived to our times so unaltered as to allow of its specific identification with a living species. I cannot enter in this place into this wide controversy. It is enough at present to remark, that the character of the Eocene fauna, as contrasted with that of the antecedent secondary formations, wears a very modern aspect, and that some able living conchologists still maintain that there are Eocene shells not specifically distinguishable from those now extant; though they may be fewer in number than was supposed in 1833. The term Miocene (from peicov melon, less; and xaivo'f kainos 9 recent) is intended to express a minor proportion of recent species (of testacea) ; the term Pliocene (from 7r\slwv pleion, more ; and xaTvoj kainos, recent), a comparative plurality of the same. It has sometimes been objected to this nomenclature that certain species of infusoria found in the chalk are still existing, and, on the other hand, the Miocene and Older CHAP. I. RECENT, POST-PLIOCENE, AND POST-TERTIARY. 5 Pliocene deposits often contain the remains of mammalia, reptiles, and fish, exclusively of extinct species. But the reader must bear in mind that the terms Eocene, Miocene, and Pliocene were originally invented with reference purely to conchological data, and in that sense have always been and are still used by me. Since the first introduction of the terms above defined, the number of new living species of shells obtained from different parts of the globe has been exceedingly great, supplying fresh data for comparison, and enabling the paleontologist to correct many erroneous identifications of fossil and recent forms. New species also have been collected in abundance from tertiary formations of every age, while newly discovered groups of strata have filled up gaps in the previously known series. Hence modifications and reforms have been called for in the classification first proposed. The Eocene, Miocene, and Pliocene periods have been made to comprehend certain sets of strata of which the fossils do not always conform strictly in the proportion of recent to extinct species with the definitions first given by me, or which are implied in the etymology of those terms. These innovations have been treated of in my ( Elements or Manual of Elementary Greology,' and in the Supplement to the fifth edition of the same, published in 1859, where some modifications of my classification, as first proposed, are introduced ; but I need not dwell on these on the present occasion, as the only formations with which we shall be concerned in the pre sent volume are those of the most modern date, or the Post-tertiary. It will be convenient to divide these into two groups, the Eecent and the Post-pliocene. In the Eecent we may comprehend those deposits in which not only all the shells but all the fossil mammalia are of living species ; in the Post-pliocene those strata in which, the shells being recent, a portion, and often a considerable one, of the accompanying 6 DEFINITION OF TERMS. CHAP. I. fossil quadrupeds belongs to extinct species. I am aware that it may be objected, with some justice, to this nomenclature, that the term Post-pliocene ought in strictness to include all geological monuments posterior in date to the Pliocene; but when I have occasion to speak of these in the aggregate, I shall call them Post-tertiary, and reserve the term Post- pliocene exclusively for Lower Post-pliocene, the Upper Post- pliocene formations being called 6 Eecent.' Cases will occur where it may be scarcely possible to draw the line of demarcation between the Newer Pliocene and Post- pliocene, or between the latter and the recent deposits ; and we must expect these difficulties to increase rather than diminish with every advance in our knowledge, and in propor tion as gaps are filled up in the series of geological records. In 1839 I proposed the term Pleistocene as an abbreviation for Newer Pliocene, and it soon became popular, because adopted by the late Edward Forbes in his admirable essay on 'The Geological Kelations of the existing Fauna and Flora of the British Isles;'* but he applied the term almost precisely in the sense in which I shall use Post-pliocene in this volume, and not as short for Newer Pliocene. In order to prevent confusion, I think it best entirely to abstain from the use of Pleistocene in future ; I have found that the introduction of such a fourth name (unless restricted solely to the older Post-tertiary formations) must render the use of Pliocene, in its original extended sense, impossible, and it is often almost indispensable to have a single term to compre hend both divisions of the Pliocene period. The annexed tabular view of the whole series of fossiliferous strata will enable the reader to see at a glance the chrono logical relation of the Eecent and Post-pliocene to the ante cedent periods. * Geological Kelations of the Survey of Great Britain, vol. i. p. 336. existing Fauna and Flora of the London, 1846.) British Isles. (Memoirs of Geological CHAP. I. TABULAR VIEW OF FOSSILIFEROUS STRATA. ABRIDGED GENERAL TABLE OF FOSSILIFEROUS STEATA. 1. RECENT. 2. POST-PLIOCENE. 3. NEWER PLIOCENE. 4. OLDER PLIOCENE. 5. UPPER MIOCENE. 6. LOWER MIOCENE. 7. UPPER EOCENE. 8. MIDDLE EOCENE. 9. LOWER EOCENE. 10. MAESTRICHT BEDS. 11. UPPER WHITE CHALK. 12. LOWER WHITE CHALK. 13. UPPER GREENSAND. J4. GAULT. 15. LOWER GREENSAND. 16. WEALDEN. 17. PURBECK BEDS. 18. PORTLAND STONE. 19. KIMMERIDGE CLAY. 20. CORAL RAG. 21. OXFORD CLAY. 22. GREAT or BATH OOLITE. 23. INFERIOR OOLITE. 24. LIAS 25. UPPER TRIAS. 26. MIDDLE TRIAS, or MUSCHELKALK. POST-TERTIARY. PLIOCENE. MIOCENE. EOCENE. CRETACEOUS. JURASSIC. TRIASSIC. y fc oO O CQ CO 27. LOWER TRIAS. ) 28. PERMIAN, or MAGNESIAN LIMESTONE PERMIAN. 29. COAL-MEASURES. u 30. CARBONIFEROUS LIMESTONE. CARBONIFEROUS. d O * 1 work before cited *, I stated that M. Desnoyers, an observer equally well versed in geology and archaeology, had disputed the conclusion arrived at by MM. Tournal and Christol, that the fossil rhinoceros, hysena, bear, and other lost species, had once been inhabitants of France contem poraneously with man. * The flint hatchets and arrow-heads ' he said, ' and the pointed bones and coarse pottery of many French and English caves, agree precisely in character with those found in the tumuli, and under the dolmens (rude altars of unhewn stone) of the primitive inhabitants of Gaul, Britain, and Germany. The human bones, therefore, in the caves which are associated with such fabricated objects, must belong not to antediluvian periods, but to a people in the same stage of civilization as those who constructed the tumuli and altars.' f In the Gaulish monuments,' he added, f we find, together with the objects of industry above mentioned, the bones of wild and domestic animals of species now inhabiting Europe, particularly of deer, sheep, wild boars, dogs, horses, and oxen. This fact has been ascertained in Quercy, and other provinces ; and it is supposed by antiquaries that the animals in question were placed beneath the Celtic altars in memory of sacrifices offered to the Gaulish divinity Hesus, and in the tombs to commemorate funeral repasts, and also from a superstition prevalent among savage nations, which induces them to lay up provisions for the manes of the dead in a * Principles, 9th eel. p. 739. 62 DESNOYERS ON HUMAN AND OTHER CAVE BONES. CHAP. iv. future life. But in none of these ancient monuments have any bones been found of the elephant, rhinoceros, hyaena, tiger, and other quadrupeds, such as are found in caves, which might certainly have been expected, had these species continued to flourish at the time that this part of Gaul was inhabited by man.'* After giving no small weight to the arguments of M. Des- noyers, and the writings of Dr. Buckland on the same subject, and visiting myself several caves in Germany, I came to the opinion that the human bones mixed with those of extinct animals, in osseous breccias and cavern mud, in different parts of Europe, were probably not coeval. The caverns having been at one period the dens of wild beasts, and having served at other times as places of human habitation, worship, sepulture, concealment, or defence, one might easily conceive that the bones of man and those of animals, which were strewed over the floors of subterranean cavities, or which had fallen into tortuous rents connecting them with the surface, might, when swept away by floods, be mingled in one promiscuous heap in the same ossiferous mud or breccia.f That such intermixtures have really taken place in some caverns, and that geologists have occasionally been deceived, and have assigned to one and the same period fossils which had really been introduced at successive times, will readily be conceded. But of late years we have obtained convincing proofs, as we shall see in the sequel, that the mammoth, and many other extinct mammalian species very common in caves, occur also in undisturbed alluvium, embedded in such a manner with works of art, as to leave no room for doubt that man and the 'mammoth coexisted. Such discoveries have * Desnoyers, Bulletin de la Societe Universelle d'Histoire Naturelle. Pa- Geologique de France, torn. ii. p. 252 ; ris, 1845. and article on Caverns, Dictionnaire t Principles, 9th ed. p. 740. CHAP. IV. DR. SCHMERLING ON HUMAN AND OTHER BONES. 63 led me, and other geologists, to reconsider the evidence pre viously derived from caves "brought forward in proof of the high antiquity of man. With a view of re-examining this evidence, I have lately explored several caverns in Belgium and other countries, and re-read the principal memoirs and treatises treating of the fossil remains preserved in them, the results of which inquiries I shall now proceed to lay before the reader. Researches, in 1833-1834, of Dr. Schmerling in the Caverns near Liege. The late Dr. Schmerling of Liege, a skillful anatomist and paleontologist, after devoting several years to the exploring of the numerous ossiferous caverns which border the valleys of the Meuse and its tributaries, published two volumes, descriptive of the contents of more than forty caverns. One of these volumes consisted of an atlas of plates, illustrative of the fossil bones.* Many of the caverns had never before been entered by scientific observers, and their floors were encrusted with unbroken stalagmite. At a very early stage of his investiga tions, Dr. Schmerling found the bones of man so rolled and scattered, as to preclude all idea of their having been inten tionally buried on the spot. He also remarked that they were of the same colour, and in the same condition as to the amount of animal matter contained in them, as those of the accom panying animals, some of which, like the cave-bear, hysena, elephant, and rhinoceros, were extinct ; others, like the wild cat, beaver, wild boar, roe-deer, wolf, and hedgehog, still extant. The fossils were lighter than fresh bones, except such as had their pores filled with carbonate of lime, in which case they * Kecherches sur les Ossements fos- a Province de Liege. Liege, 1833 siles decouverts dans les Cavernes de 1834. 64 HUMAN AND OTHER BONES IN LIE*GE CAVERNS. CHAP. iv. were often much heavier. The human remains of most frequent occurrence were teeth detached from the jaw, and the carpal, metacarpal, tarsal, metatarsal, and phalangial bones separated from the rest of the skeleton. The cor responding bones of the cave-bear, the most abundant of the accompanying mammalia, were also found in the Liege caverns more commonly than any others, and in the same scattered condition. Occasionally, some of the long bones of mammalia were observed to have been first broken across, and then reunited or cemented again by stalagmite, as they lay on the floor of the cave. No gnawed bones nor any coprolites were found by Schmerling. He therefore inferred that the caverns of the province of Liege had not been the dens of wild beasts, but that their organic and inorganic contents had been swept into them by streams communicating with the surface of the country. The bones, he suggested, may often have been rolled in the beds of such streams before they reached their underground destination. To the same agency the intro duction of many land-shells dispersed through the cave-mud was ascribed, such as Helix nemoralis, H. lapicida, H. po- matia, and others of living species. Mingled with such shells, in some rare instances, the bones of fresh-water fish, and of a snake (Coluber\ as well as of several birds, were detected. The occurrence here and there of bones in a very perfect state, or of several bones belonging to the same skeleton in natural juxtaposition, and having all their most delicate apophyses uninjured, while many accompanying bones in the same breccia were rolled, broken, or decayed, was accounted for by supposing that portions of carcasses were sometimes floated in during floods while still clothed with their flesh. No example was discovered of an entire skeleton, not even of one of the smaller mammalia, the bones of which are usually the least injured. CHAP. iv. REMAINS IN THE ENGIS AND ENGIHOUL CAYES. 65 The incompleteness of each skeleton was especially ascer tained in regard to the human subjects, Dr. Schmerling being careful, whenever a fragment of such presented itself, to explore the cavern himself, and see whether any other bones of the same skeleton could be found. In the Engis cavern, distant about eight miles to the south-west of Liege, on the left bank of the Meuse, the remains of at least three human individuals were disinterred. The skull of one of these, that of a young person, was embedded by the side of a mammoth's tooth. It was entire, but so fragile, that nearly all of it fell to pieces during its extraction. Another skull, that of an adult in dividual (see fig. 2, p. 81), and the only one preserved by Dr. Schmerling in a sufficient state of integrity to enable the anatomist to speculate on the race to which it belonged, was buried five feet deep in a breccia, in which the tooth of a rhinoceros, several bones of a horse, and some of the rein deer, together with some ruminants, occurred. This skull, now in the museum of the University of Liege, is figured in Chap. V., where further observations will be offered on its anatomical character, after a fuller account of the contents of the Liege caverns has been laid before the reader. On the right bank of the Meuse, on the opposite side of the river to Engis, it the cavern of Engihoul. Both were observed to abound greatly in the bones of extinct animals mingled with those of man ; but with this difference, that whereas in the Engis cave there were several human crania and very few other bones, in Engihoul there occurred nu merous bones of the extremities belonging to at least three human individuals, and only two small fragments of a cranium. The like capricious distribution held good in other caverns, especially with reference to the cave-bear, the most frequent of the extinct mammalia. Thus, for example in the cave of Chokier, skulls of the bear were few, and other parts of the skeleton abundant, whereas in several other F 66 IMPLEMENTS OF FLINT AND BONE. CHAP. IV. caverns these proportions were exactly reversed, while at Groffontaine skulls of the bear and other parts of the skeleton were found in their natural numerical proportions. Speaking generally, it may be said that human bones, where any were met with, occurred at all depths in the cave-mud and gravel, sometimes above and sometimes below those of the bear, elephant, rhinoceros, hysena, &c. Some rude flint implements of the kind commonly called flint knives or flakes, of a triangular form in the cross section (as in fig. 14, p. 118), were found by Schmerling dispersed generally through the cave-mud, but he was too much en grossed with his osteological inquiries to collect them dili gently. He preserved some few of them, however, which I have seen in the museum at Liege. He also discovered in the cave of Chokier, two and a half miles south-west from Liege, a polished and jointed needle-shaped bone, with a hole pierced obliquely through it at the base ; such a cavity, he observed, as had never given passage to an artery. This instrument was embedded in the same matrix with the remains of a rhinoceros.* Another cut bone and several artificially shaped flints were found in the Engis cave, near the human skulls before alluded to. Schmerling observed, and we shall have to refer to the fact in the sequel (Chap. VIII.), that although in some forty fossiliferous caves explored by him human bones were the exception, yet these flint implements were universal, and he added that ' none of them could have been subsequently in troduced, being precisely in the same position as the remains of the accompanying animals.' ( I therefore,' he continues, ( attach great importance to their presence ; for even if I had not found the human bones under conditions entirely favour able to their being considered as belonging to the ante- * Schmerling, part ii. p. 177. CHAP. iv. DR. SCHMERLING ON LIEGE CAVERNS. 67 diluvian epoch, proofs of man's existence would still have been supplied by the cut bones and worked flints.' * Dr. Schmerling, therefore, had no hesitation in concluding from the various facts ascertained by him, that man once lived in the Liege district contemporaneously with the cave- bear, and several other extinct species of quadrupeds. But he was much at a loss when he attempted to invent a theory to explain the former state of the fauna of the region now drained by the Meuse ; for he shared the notion, then very prevalent among naturalists, that the mammoth and the hysenaf were beasts of a warmer climate than that now proper to Western Europe. In order to account for the presence of such ' tropical species,' he was half-inclined to imagine that they had been transported by a flood from some distant region ; then again he raised the question whether they might not have been washed out of an older alluvium, which may have pre-existed in the neighbourhood. This last hypothesis was directly at variance with his own statements, that the remains of the mammoth and hysena were identical in appearance, colour, and chemical condition with those of the bear and other associated fossil animals, none of which exhibited signs of having been previously enveloped in any dissimilar matrix. Another enigma which led Schmerling astray in some of his geological speculations was the supposed presence of the agouti, a South-American rodent, 'proper to the torrid zone.' My friend M. Lartet, guided by Schmer- ling's figures of the teeth of this species, suggests, and I have little doubt with good reason, that they appertain to the porcupine, a genus found fossil in post-pliocene deposits of certain caverns in the south of France. In the year 1833, I passed through Liege, on my way to the Ehine, and conversed with Dr. Schmerling, who showed * Schmerling, partii. p. 179. t Ibid, part ii. pp. 70, 96. F 2 68 SCHMEELING ON ANTIQUITY OF MAN. CHAP. iv. me his splendid collection, and when I expressed some incredulity respecting the alleged antiquity of the fossil human bones, he pointedly remarked, that if I doubted their having been contemporaneous with the bear or rhinoceros, on the ground of man being a species of more modern date, I ought equally to doubt the coexistence of all the other living species, such as the red deer, roe, wild cat, wild boar, wolf, fox, weasel, beaver, hare, rabbit, hedgehog, mole, dor mouse, field-mouse, water-rat, shrew, and others, the bones of which he had found scattered everywhere indiscriminately through the same mud with the extinct quadrupeds. The year after this conversation I cited Schmerling's opinions, and the facts bearing on the antiquity of man, in the 3rd edition of my Principles of Geology (p. 161, 1834), and in succeeding editions, without pretending to call in question their trustworthiness, but at the same time without giving them the weight which I now consider they were entitled to. He had accumulated ample evidence to prove that man had been introduced into the earth at an earlier period than geologists were then willing to believe. One positive fact, it will be said, attested by so competent a witness, ought to have outweighed any amount of negative testimony, previously accumulated, respecting the non-occur rence elsewhere of human remains in formations of the like antiquity. In reply, I can only plead that a discovery which seems to contradict the general tenor of previous investiga tions is naturally received with much hesitation. To have un dertaken in 1832, with a view of testing its truth, to follow the Belgian philosopher through every stage of his observations and proofs, would have been no easy task even for one well- skilled in geology and osteology. To be let down, as Schmer- ling was, day after day, by a rope tied to a tree, so as to slide to the foot of the first opening of the Engis cave,* where the * Sclimerling, part i. p. 30. CHAP. iv. PRESENT STATE OF BELGIAN CAYES. 69 best-preserved human skulls were found; and, after thus gaining access to the first subterranean gallery, to creep on all fours through a contracted passage leading to larger chambers, there to superintend by torchlight, week after week and year after year, the workmen who were breaking through the stalagmitic crust as hard as marble, in order to remove piece by piece the underlying bone-breccia nearly as hard ; to stand for hours with one's feet in the mud, and with water dripping from the roof on one's head, in order to mark the position and guard against the loss of each single bone of a skeleton ; and at length, after finding leisure, strength, and courage for all these operations, to look forward, as the fruits of one's labour, to the publication of unwelcome in telligence, opposed to the prepossessions of the scientific as well as. of the unscientific public; when these circum stances are taken into account, we need scarcely wonder, not only that a passing traveller failed to stop and scrutinise the evidence, but that a quarter of a century should have elapsed before even the neighbouring professors of the University of Liege came forth to vindicate the truthfulness of their indefatigable and clear-sighted countryman. In 1860, when I revisited Liege, twenty-six years after my interview with Schmerling, I found that several of the caverns described by him had in the interval been annihilated. Not a vestige, for example, of the caves of Engis, Chokier, and Groffontaine remained. The calcareous stone, in the heart of which the cavities once existed, had been quarried away, and removed bodily for building and lime-making. Fortunately, a great part of the Engihoul cavern, situated on the right bank of the Meuse, was still in the same state as when Schmerling delved into it in 1831, and drew from it the bones of three human skeletons. I determined, there fore, to examine it, and was so fortunate as to obtain the as sistance of a zealous naturalist of Liege, Professor Malaise, 70 PRESENT STATE OF BELGIAN CAVES. CHAP. iv. who accompanied me to the cavern, where we engaged some workmen to break through the crust of stalagmite, so that we could search for bones in the undisturbed earth beneath. Bones and teeth of the cave-bear were soon found, and several other extinct quadrupeds which Schmerling has enu merated. My companion, continuing the work perseveringly for weeks after my departure, succeeded at length in ex tracting from the same deposit, at the depth of two feet below the crust of stalagmite, three fragments of a human skull, and two perfect lower jaws with teeth, all associated in such a manner with the bones of bears, large pachyderms, and ruminants, and so precisely resembling these in colour and state of preservation, as to leave no doubt in his mind that man was contemporary with the extinct animals. Pro fessor Malaise has given figures of the human remains in the bulletin of the royal academy of Belgium for I860.* The rock in which the Liege caverns occur belongs gene rally to the carboniferous or mountain limestone, in some few cases only to the older Devonian formation. Whenever the work of destruction has not gone too far, magnificent sections, sometimes 200 and 300 feet in height, are exposed to view. They confirm Schmerling's doctrine, that most of the materials, organic and inorganic, now filling the caverns, have been washed into them through narrow vertical or oblique fissures, the upper extremities of which are choked up with soil and gravel, and would scarcely ever be discover able at the surface, especially in so wooded a country. Among the sections obtained by quarrying, one of the finest which I saw was in the beautiful valley of Fond du Foret, above Chaudefontaine, not far from the village of Magnee, where one of the rents communicating with the surface has been filled up to the brim with rounded and half-rounded stones, * Tom. x. p. 546. CHAP. iv. STALACTITE IN CAVES. 71 angular pieces of limestone and shale, besides sand and mud, together with bones, chiefly of the cave-bear. Connected with this main duct, which is from one to two feet in width, are several minor ones, each from one to three inches wide, also extending to the upper country or table-land, and choked up with similar materials. They are inclined at angles of 30 and 40, their walls being generally coated with stalactite, pieces of which have here and there been broken off and mingled with the contents of the rents, thus helping to explain why we so often meet with detached pieces of that substance in the mud and breccia of the Belgian caves. It is not easy to conceive that a solid horizontal floor of hard stalagmite should, after its formation, be broken up by run ning water ; but when the walls of steep and tortuous rents, serving as feeders to the principal fissures and to inferior vaults and galleries are encrusted with stalagmite, some of the incrustation may readily be torn up when heavy fragments of rock are hurried by a flood through passages inclined at angles of 30 or 40. The decay and decomposition of the fossil bones seem to have been arrested in most of the caves by a constant sup ply of water charged with carbonate of lime, which dripped from the roofs while the caves were becoming gradually filled up. By similar agency the mud, sand, and pebbles were usually consolidated. The following explanation of this phenomenon has been suggested by the eminent chemist Liebig. On the surface of Franconia, where the limestone abounds in caverns, is a fertile soil in which vegetable matter is continually decaying. This mould or humus, being acted on by moisture and air, evolves carbonic acid, which is dissolved by rain. The rain water, thus impregnated, permeates the porous limestone, dissolves a portion of it, and afterwards, when the excess of carbonic acid evaporates in the caverns, parts with the 72 ENGULFED RIVERS NEAR LI^GE. CHAP. iv. calcareous matter and forms stalactite. So long as water flows, even occasionally, through a suite of caverns, no layer of pure stalagmite can be produced ; hence the formation of such a layer, is generally an event posterior in date to the cessation of the old system of drainage, an event which might be brought about by an earthquake causing new fissures, or by the river wearing its way down to a lower level, and thenceforth running in a new channel. In all the subterranean cavities, more than forty in num ber, explored by Schmerling, he only observed one cave, namely that of Chokier, where there were two regular layers of stalagmite, divided by fossiliferous cave-mud. In this instance, we may suppose that the stream, after flowing for a long period at one level, cut its way down to an inferior suite of caverns, and, flowing through them for centuries, choked them up with debris ; after which it rose once more to its original higher level : just as in the mountain limestone district of Yorkshire some rivers, habitually absorbed by a ( swallow hole,' are occasionally unable to discharge all their water through it^; in which case they rise and rush through a higher subterranean passage, which was at some former period in the regular line of drainage, as is often attested by the fluviatile gravel still contained in it. There are now in the basin of the Meuse, not far from Liege, several examples of engulfed brooks and rivers : some of them, like that of St. Hadelin, east of Chaudefontaine, which reappears after an underground course of a mile or two ; others, like the Vesdre, which is lost near G-offontaine, and after a time re-emerges ; some, again, like the torrent near Magnee, which, after entering a cave, never again comes to the day. In the season of floods such streams are turbid at their entrance, but clear as a mountain-spring where they issue again ; so that they must be slowly filling up cavities in the interior with mud, sand, pebbles, snail-shells, and CHAP. iv. ANTIQUITY OF Llf GE CAVE-BONES. 73 the bones of animals which may be carried away during floods. The manner in which some of the large thigh and shank bones of the rhinoceros and other pachyderms are rounded, while some of the smaller bones of the same creatures, and of the hysena, bear, and horse, are reduced to pebbles, shows that they were often transported for some distance in the channels of torrents, before they found a resting-place. When we desire to reason or speculate on the probable antiquity of human bones found fossil in such situations as the caverns near Liege, there are two classes of evidence to which we may appeal for our guidance. First, considerations of the time required to allow of many species of carnivorous and herbivorous animals, which flourished in the cave period, becoming first scarce, and then so entirely extinct as we have seen that they had become before the era of the Danish peat and Swiss lake dwellings : secondly, the great number of centuries necessary for the conversion of the physical geography of the Liege district from its ancient to its present configuration ; so many old underground channels, through which brooks and rivers flowed in the cave period, being now laid dry and choked up. The great alterations which have taken place in the shape of the valley of the Meuse and some of its tributaries are often demonstrated by the abrupt manner in which the mouths of fossiliferous caverns open in the face of perpen dicular precipices 200 feet or more in height above the present streams. There appears also, in many cases, to be such a correspondence in the openings of caverns on opposite sides of some of the valleys, both large and small, as to incline one to suspect that they originally belonged to a series of tunnels and galleries which were continuous before the present system of drainage came into play, or before the existing valleys were scooped out. Other signs of subsequent 74 ANTIQUITY OF LIEGE C AYE-BONES. CHAP. iv. fluctuations are afforded by gravel containing elephant's bones at slight elevations above the Meuse and several of its tributaries. The loess also, in the suburbs and neighbour hood of Liege, occurring at various heights in patches lying at between 20 and 200 feet above the river, cannot be explained without supposing the filling up and re-excavation of the valleys at a period posterior to the washing in of the animal remains into most of the old caverns. It may be objected that, according to the present rate of change, no lapse of ages would suffice to bring about such revolutions in physical geography as we are here contemplating. This may be true. It is more than probable that the rate of change was once far more active than it is now. Some of the nearest volcanoes, namely, those of the Lower Eifel about sixty miles to the eastward, seem to have been in eruption in post-pliocene times, and may perhaps have been connected and coeval with repeated risings or sinkings of the land in the basin of the Meuse. It might be said, with equal truth, that according to the present course of events, no series of ages would suffice to reproduce such an assem-. blage of cones and craters as those of the Eifel (near An- dernach for example); and yet ^ome of them may be of sufficiently modern date to belong to the era when man was contemporary with the mammoth and rhinoceros in the basin of the Meuse. But, although we may be unable to estimate the minimum of time required for the changes in physical geography above alluded to, we cannot fail to perceive that the duration of the period must have been very protracted, and that other ages of comparative inaction may have followed, separating the post-pliocene from the historical periods, and constituting an interval no less indefinite in its duration. CHAP. T. NEANDERTHAL SKELETON. CHAPTER V. POST-PLIOCENE PERIOD FOSSIL HUMAN SKULLS OF THE NEANDERTHAL AND ENGIS GATES. HUMAN SKELETON FOUND IN CAVE NEAE DUSSELDORF ITS GEOLOGICAL POSITION AND PROBABLE AGE ITS ABNORMAL AND APE-LIKE CHA RACTERS FOSSIL HUMAN SKULL OF THE ENGIS CAVE NEAR LIEGE PROFESSOB HUXLEY'S DESCRIPTION OF THESE SKULLS COMPARISON OF EACH, WITH EXTREME VARIETIES OF THE NATIVE AUSTRALIAN RACE RANGE OF CAPACITY IN THE HUMAN AND SIMIAN BRAINS SKULL FROM BORREBY IN DENMARK CONCLUSIONS OF PROFESSOR HUXLEY BEARING OF THE PECULIAR CHARACTERS OF THE NEAN DERTHAL SKULL ON THE HYPOTHESIS OF TRANSMUTATION. Fossil human Skeleton of the Neanderthal Cave near Dusseldorf. TJEFORE I speak more particularly of the opinions which JLJ anatomists have expressed respecting the osteological characters of the human skull from Engis, near Liege, mentioned in the last chapter and described by Dr. Schmer- ling, it will be desirable to say something of the geological position of another skull, or rather skeleton, which, on account of its peculiar conformation, has excited no small sensation in the last few years. I allude to the skull found in 1857, in a cave situated in that part of the valley of the Diissel, near Dusseldorf, which is called the Neanderthal. The spot is a deep and narrow ravine about seventy English miles north-east of the region of the Liege caverns treated of in the last chapter, and close to the village and railway station of Hochdal between Dusseldorf and Elberfeld. The cave occurs in the precipitous southern or left side of the winding ravine, about sixty feet above the stream, and a 76 GEOLOGICAL POSITION OF NEANDERTHAL SKELETON. CHAP. v. hundred feet below the top of the cliff. The accompanying section will give the reader an idea of its position. Fig. 1 Section of the Neanderthal Cave near Diisseldorf. a Cavern 60 feet above the Diissel, and 100 feet below the surface of the country at c. b Loam covering the floor of the cave near the bottom of which the human skeleton was found. b, c Kent connecting the cave with the upper surface of the country. d Superficial sandy loam. e Devonian limestone. / Terrace, or ledge of rock. When Dr. Fuhlrott of Elberfeld first examined the cave, he found it to be high enough to allow a man to enter. The width was seven or eight feet, and the length or depth fifteen. I visited the spot in 1860, in company with Dr. Fuhlrott, who had the kindness to come expressly from Elberfeld to be my guide, and who brought with him the original fossil skull, and a cast of the same, which he pre sented to me. In the interval of three years, between 1857 and 1860, the ledge of rock, /, on which the cave opened, and which was originally twenty feet wide, had been almost entirely quarried away, and, at the rate at which the work of dilapidation was proceeding, its complete destruction seemed near at hand. In the limestone are many fissures, one of which, still partially filled with mud and stones, is represented in the section at a c as continuous from the cave to the upper CHAP. v. NEANDERTHAL SKELETON. 77 surface of the country. Through this passage the loam, and possibly the human body to which the bones belonged, may have been washed into the cave below. The loam, which covered the uneven bottom of the cave, was sparingly mixed with rounded fragments of chert, and was very similar in composition to that covering the general surface of that region. There was no crust of stalagmite overlying the mud in which the human skeleton was found, and no bones of other animals in the mud with the skeleton ; but just before our visit in 1860 the tusk of a bear had been met with in some mud in a lateral embranchment of the cave, in a situation precisely similar to 6, fig. 1, and on a level corresponding with that of the human skeleton. This tusk, shown us by the proprietor of the cave, was two and a half inches long and quite perfect ; but whether it was referable to a recent or extinct species of bear, I could not determine. From a printed letter of Dr. Fuhlrott we learn that on removing the loam, which was five feet thick, from the cave, the human skull was first noticed near the entrance, and, further in, the other bones lying in the same horizontal plane. It is supposed that the skeleton was complete, but the workmen, ignorant of its value, scattered and lost most of the bones, preserving only the larger ones.* The cranium, which Dr. Fuhlrott showed me, was covered both on its outer and inner surface, and especially on the latter, with a profusion of dendritical crystallisations, and some other bones of the skeleton were ornamented in the same way. These markings, as Dr. Hermann von Meyer observes, afford no sure criterion of antiquity, for they have been observed on Eoman bones. Nevertheless, they are more common in bones that have been long embedded in * Letter to Professor Schaaffhausen, cited Natural History Keview, No. 2, p. 156. 78 NEANDERTHAL SKULL. CHAP. v. the earth. The skull and bones, moreover, of the Neander thal skeleton had lost so much of their animal matter as to adhere strongly to the tongue, agreeing in this respect with the ordinary condition of fossil remains of the post- pliocene period. On the whole, I think it probable that this fossil may be of about the same age as those found by Schmerling in the Liege caverns ; but, as no other animal remains were found with it, there is no proof that it may not be newer. Its position lends no countenance whatever to the supposition of its being more ancient. When the skull and other parts of the skeleton were first exhibited at a German scientific meeting at Bonn, in 1857, some doubts were expressed by several naturalists, whether it was truly human. Professor Schaaffhausen, who, with the other experienced zoologists, did not share these doubts, observed that the cranium, which included the frontal bone, both parietals, part of the squamous, and the upper third of the occipital, was of unusual size and thickness, the forehead narrow and very low, and the pro jection of the supra-orbital ridges enormously great. He also stated that the absolute and relative length of the thigh bone, humerus, radius, and ulna, agreed well with the di mensions of a European individual of like stature at the present day ; but that the thickness of the bones was very extraordinary, and the elevation and depression for the at tachment of muscles were developed in an unusual degree. Some of the ribs, also, were of a singularly rounded shape and abrupt curvature, which was supposed to indicate great power in the thoracic muscles.* In the same memoir, the Prussian anatomist remarks that the depression of the forehead, see fig. 3, p. 82, is not due to any artificial flattening, such as is practised in various * Professor Schaaffhausen' s Memoir, translated, Natural History Eeview, No. 2, April 1861. CHAP. v. SKULL OF ENGIS, NEAR LIEGE. 79 modes by barbarous nations in the Old and New World, the skull being quite symmetrical, and showing no indication of counter-pressure at the occiput; whereas, according to Morton, in the Flat-heads of the Columbift, the frontal and parietal bones are always unsymmetrical.* On the whole, Professor SchaafThausen concluded that the individual to whom the Neanderthal skull belonged must have been dis tinguished by small cerebral development, and uncommon strength of corporeal frame. When on my return to England I showed the cast of the cranium to Professor Huxley, he remarked at once that it was the most ape-like skull he had ever beheld. Mr. Busk, after giving a translation of Professor Schaaff hausen's me moir in the Natural History Review, f added some valuable comments of his own on the characters in which this skull approached that of the gorilla and chimpanzee. Professor Huxley afterwards studied the cast with the object of assisting me to give illustrations of it in this work, and in doing so discovered what had not previously been observed, that it was quite as abnormal in the shape of its occipital as in that of its frontal or superciliary region. Before citing his words on the subject, I will offer a few remarks on the Engis skull which the same anatomist has compared with that of the Neanderthal. Fossil Skull of the Engis Cave near Liege. Among six or seven human skeletons, portions of which were collected by Dr. Schmerling from three or four caverns near Liege, embedded in the same matrix with the remains of the elephant, rhinoceros, bear, hyaena, and other extinct qua drupeds, the most perfect skull, as I have before stated, p. 65, was that of an adult individual found in the cavern of Engis. * Natural History Eeview, No. 2, p. 160. t No. 2, 1861. 80 SKULL OF ENGIS, NEAR Ll GE. CHAP. V. This skull, Dr. Schmerling figured in his work, observing that it was too imperfect to enable the anatomist to deter mine the facial angle, but that one might infer, from the narrowness of tbe frontal portion, that it belonged to an in dividual of small intellectual development. He speculated on its Ethiopian affinities, but not confidently, observing truly that it would require many more specimens to enable an anatomist to arrive at sound conclusions on such a point. M. Greoffroy St. Hilaire and other osteologists, who examined the specimen, denied that it resembled a negro's skull. When I saw the original in the museum at Liege, I invited Dr. Spring, one of the professors of the university, to whom we are indebted for a valuable memoir on the human bones found in the cavern of Chauvaux near Namur, to have a cast made of this Engis skull. He not only had the kind ness to comply with my request, but rendered a service to the scientific world by adding to the original cranium several detached fragments which Dr. Schmerling had ob tained from Engis, and which were found to fit in exactly, so that the cast represented at fig. 2 is more complete than that given in the first plate of Schmerling's work. It exhibits on the right side the position of the auditory foramen (see fig. 6, p. 88), which was not included in Schmerling's figure. Mr. Busk, when he saw this cast, remarked to me that, although forehead was, as Schmerling had truly stated, some what narrow, it might nevertheless be matched by the skulls of individuals of European race, an observation since fully borne out by measurements, as will be seen in the sequel. OBSERVATIONS BY PROFESSOR HUXLEY ON THE HUMAN SKULLS OF ENGIS AND THE NEANDERTHAL. ' The Engis skull, as originally figured by Professor Schmerling, was in a very imperfect state ; but other fragments have since been added to it by the care of Dr. Spring, and the cast upon which my CHAP. V. SKULL OF EflGIS, NEAR LI^GE. 81 observations are based (fig. 2) exhibits the frontal, parietal, and occipital regions, as far as the middle of the occipital foramen, with the squamous and mastoid portions of the right temporal bone entire, or nearly so, while the left temporal bone is wanting. From the middle of the occipital foramen to the middle of the roof of each orbit, the base of the skull is destroyed, and the facial bones are entirely absent. Fig. 2 i Side view of the cast of part of a human skull found by Dr. Schmerling embedded amongst the remains of extinct mammalia in the cave of Engis, near Liege. a Superciliary ridge and glabella. b Coronal suture. c The apex of the lambdoidal suture. d The occipital protuberance. ' The extreme length of the skull is 7'7 inches, and as its extreme breadth is not more than 5' 25, its form is decidedly dolichocephalic. At the same time its height (4| inches from the plane of the glabello-occipital line (a d) to the vertex) is good, and the forehead is well arched ; so that while the horizontal circumference of the skull is about 20^- inches, the longitudinal arc from the nasal spine of G 82 NEANDERTHAL SKULL. CHAP. V. the frontal bone to the occipital protuberance (d~] measures about 13| inches. The transverse arc from one auditory foramen to the other across the middle of the sagittal suture measures about 13 inches. The sagittal suture (b c) is 5-J inches in length. The superciliary prominences are well, but not excessively, developed, and are sepa rated by a median depression in the region of the glabella. They indicate large frontal sinuses. If a line joining the glabella and the occipital protuberance (a d) be made horizontal, no part of the occiput projects more than y^th of an inch behind the posterior ex tremity of that line ; and the upper edge of the auditory foramen is almost in contact with the same line, or rather with one drawn parallel to it on the outer surface of the skull. Fig. 3 Side view of the cast of a part of a human skull from a cave in the Neanderthal near Diisseldorf. a The superciliary ridge and glabella. b The coronal suture. c The apex of the lambdoidal suture. d The occipital protuberance. ' The Neanderthal skull, with which also I am acquainted only by means of Professor Schaaffhausen's drawings of an excellent cast and of photographs, is so extremely different in appearance from the Engis cranium, that it might well be supposed to belong to a distinct race of mankind. It is 8 inches in extreme length and 5*75 inches in CHAP. V. NEANDERTHAL SKULL. 83 extreme breadth, but only measures 3 '4 inches from the glabello- occipital line to the vertex. The longitudinal arc, measured as above, is 12 inches; the transverse arc cannot be exactly ascer tained, in consequence of the absence of the temporal bones, but was probably about the same, and certainly exceeded 10| inches. The horizontal circumference is 23 inches. This great circum ference arises largely from the vast development of the super ciliary ridges, which are occupied by great frontal sinuses whose inferior apertures are displayed exceedingly well in one of Dr. Fig. 4 Outline of the skull of an adult Chimpanzee, of that from the Neanderthal, and of that of a European, drawn to the same absolute size, in order better to exhibit their relative differences. The superciliary region of the Neanderthal skull appears less prominent than in fig. 3, as the contours are all taken along the middle line where the superciliary projection of the Neanderthal skull is least marked, a The glabella. b The occipital protuberance, or the point on the exterior of each skull which corresponds roughly with the attachment of the tentorium, or with the inferior boundary of the posterior cerebral lobes. Fuhlrott's photographs, and form a continuous transverse prominence, somewhat excavated in the middle line, across the lower part of the brows. In consequence of this structure, the forehead appears still lower and more retreating than it really is. To an anatomical eye the posterior part of the skull is even more striking than the an terior. The occipital protuberance occupies the extreme posterior end of the skull when the glabello-occipital line is made horizontal, G 2 84 NEANDERTHAL SKULL. CHAP. v. and so far from any part of the occipital region extending beyond it, this region of the skull slopes obliquely upward and forward, so that the lambdoidal suture is situated well upon the upper surface of the cranium. At the same time, notwithstanding the great length of the skull, the sagittal suture is remarkably short (41 inches), and the squamosal suture is very straight. * In human skulls, the superior curved ridge of the occipital bone and the occipital protuberance correspond, approximative^, with the level of the tentorium and with the lateral sinuses, and con sequently with the inferior limit of the posterior lobes of the brain. At first, I found some difficulty in believing that a human brain could have its posterior lobes so flattened and diminished as must have been the case in the Neanderthal man, supposing the ordi nary relation to obtain between the superior occipital ridges and the tentorium; but on my application, through Sir Charles Lyell, Dr. Fuhlrott, the possessor of the skull, was good enough not only to ascertain the existence of the lateral sinuses in their ordinary posi tion, but to send convincing proofs of the fact, in excellent photo graphic views of the interior of the skull, exhibiting clear indications of these sinuses. ' There can be no doubt that, as Professor Schaaffhausen and Mr. Busk have stated, this skull is the most brutal of all known human skulls, resembling those of the apes not only in the prodigious development of the superciliary prominences and the forward ex tension of the orbits, but still more in the depressed form of the brain-case, in the straightness of the squamosal suture, and in the complete retreat of the occiput forward and upward, from the superior occipital ridges. ' But the cranium, in its present condition, is stated by Professor Schaaffhausen to contain 1033'24 cubic centimeters of water, or, in other words, about 63 English cubic inches. As the entire skull could hardly have held less than 12 cubic inches more, its minimum capacity may be estimated at 75 cubic inches. The most capacious healthy European skull yet measured had a capacity of 114 cubic inches, the smallest (as estimated by weight of brain) about 55 cubic inches, while, according to Professor Schaaffhausen, some Hindoo skulls have as small a capacity as about 46 cubic inches (27 oz. of water). The largest cranium of any Gorilla yet measured contained 34' 5 cubic inches. The Neanderthal cranium stands, therefore, in capacity, very nearly on a level with the mean of the two human extremes, and very far above the pithecoid maximum. ( Hence, even in the absence of the bones of the arm and thigh, CHAP. v. BORREBY SKULL. 85 which, according to Professor Schaaffhausen, had the precise propor tions found in man, although they were much stouter than ordinary- human bones, there could be no reason for ascribing this cranium to anything but a man ; while the strength and development of the muscular ridges of the limb-bones are characters in perfect accord ance with those exhibited, in a minor degree, by the bones of such hardy savages, exposed to a rigorous climate, as the Patagonians. 1 The Neanderthal cranium has certainly not undergone compression, and, in reply to the suggestion that the skull is that of an idiot, it may be urged that the onus probandi lies with those who adopt the hypothesis. Idiotcy is compatible with very various forms and ca pacities of the cranium, but I know of none which present the least resemblance to the Neanderthal skull ; and, furthermore, I shall pro ceed to show that the latter manifests but an extreme degree of a stage of degradation exhibited, as a natural condition, by the crania of certain races of mankind. * Mr. Busk drew my attention, some time ago, to the resemblance between some of the skulls taken from tumuli of the stone period at Borreby in Denmark, of which Mr. Busk possesses numerous accurate figures, and the Neanderthal cranium. One of the Borreby skulls in particular (fig. 5, p. 86) has remarkably projecting superciliary ridges, a retreating forehead, a low flattened vertex, and an occiput which shelves upward and forward. But the skull is relatively higher and broader, or more brachycephalic, the sagittal suture longer, and the superciliary ridges less projecting, than in the Neanderthal skull. Nevertheless, there is, without doubt, much resemblance in character between the two skulls, a circumstance which is the more interesting, since the other Borreby skulls have better fore heads and less prominent superciliary ridges, and exhibit altogether a higher conformation. ; The Borreby skulls belong to the stone period of Denmark, and the people to whom they appertained were probably either contem poraneous with, or later than, the makers of the " refuse-heaps " of that country. In other words, they were subsequent to the last great physical changes of Europe, and were contemporaries of the urus and bison, not of the Elephas primigenius, Rhinoceros tichorhinus, and Hyaena spelcea. ' Supposing for a moment, what is not proven, that the Neanderthal skull belonged to a race allied to the Borreby people and was as modern as they, it would be separated by as great a distance of time as of anatomical character from the Engis skull, and the possibility of its belonging to a distinct race from the latter might reasonably appear to be greatly heightened. 80 BORREBY SKULL. CHAP. V. ' To prevent the possibility of reasoning in a vicious circle, how ever, I thought it would be well to endeavour to ascertain what amount of cranial variation is to be found in a pure race at the present Fig. 5 Skull associated with ground flint implements, from a tumulus at Borreby in Denmark, after a camera lucida drawing by Mr. Gr. Busk, F.K.S. The thick dark line indicates so much of the skull as corresponds with the fragment from the Neanderthal. a Superciliary ridge, c The apex of the lambdoidal suture. b Coronal suture. d The occipital protuberance. e The auditory foramen. CHAP. v. ENGIS AND AUSTRALIAN SKULLS COMPARED. 87 day ; and as the natives of Southern and Western Australia are probably as pure and homogeneous in blood, customs, and language, as any race of savages in existence, I turned to them, the more readily as the Hunterian museum contains a very fine collection of such skulls. ' I soon found it possible to select from among these crania two (con nected by all sorts of intermediate gradations), the one of which should very nearly resemble the Engis skull, while the other should some what less closely approximate the Neanderthal cranium in form, size, and proportions. And at the same time others of these skulls pre sented no less remarkable affinities with the low type of Borreby skull. ' That the resemblances to which I allude are by no means of a merely superficial character, is shown by the accompanying diagram (fig. 6, p. 88), which gives the contours of the two ancient and of one of the Australian skulls, and by the following table of measure ments. A B C D E F Engis 20 13f 12 43 7f 5 ? Australian, No. 1 201 13 12 4- 71 5 Australian, No. 2 22 12 10f 3 7-9 5| Neanderthal 23 12 10 3f 8 ^4 A The horizontal circumference in the plane of a line joining the glabella, with the occipital protuberance. B The longitudinal arc from the nasal depression along the middle line of the skull to the occipital tuberosity. c From the level of the glabello-occipital line on each side, across the middle of the sagittal suture to the same point on the opposite side. D The vertical height from the glabello-occipital line. E The extreme longitudinal measurement. F The extreme transverse measurement.* ' The question whether the Engis skull has rather the character of one of the high races or of one of the lower has been much disputed, but the following measurements of an English skull, noted in the cata logue of the Hunterian museum as typically Caucasian (see fig. 4) will serve to show that both sides may be right, and that cranial measurements alone afford no safe indication of race. * I have taken the glabello-occipital line as a base in these measurements, simply because it enables me to com pare all the skulls, whether fragments or entire, together. The greatest cir cumference of the English skull lies in a plane considerably above that of the glabello-occipital line, and amounts to twenty-two inches. 83 ENGIS AND NEANDERTHAL SKULLS. CHAP. v. English . A 21 B 13} C 12* 7 * In making the preceding statement, it must be clearly understood that I neither desire to affirm that the Engis and Neanderthal skulls belong to the Australian race, nor to assert even that the ancient Fig. 6 Outlines of the skull from the Neanderthal, of an Australian skull from Port Adelaide, and of the skull from the Cave of Engis, drawn to the same absolute length, in order the better to contrast their proportions. a b As in figure 4, p. 80. e The position of the auditory foramen of the Engis skull. skulls belong to one and the same race, so far as race is measured by language, colour of skin, or character of hair. Against the con clusion that they are of the same race as the Australians various minor anatomical differences of the ancient skulls, such as the great development of the frontal sinuses, might be urged ; while against the supposition of either the identity, or the diversity, of race of the two arises the known independence of the variation of cranium on the one hand, and of hair, colour, and language on the other. ' But the amount of variation of the Borreby skulls, and the fact that the skulls of one of the purest and most homogeneous of existing races of men can be proved to differ from one another in the same characters, though perhaps not quite to the same extent, as the Engis CHAP. v. COMPARISON OF HUMAN AND SIMIAN SKULLS. 89 and Neanderthal skulls, seem to me to prohibit any cautious reasoner from affirming the latter to have been necessarily of distinct races. ' The marked resemblances between the ancient skulls and their modern Australian analogues, however, have a profound interest, when it is recollected that the stone axe is as much the weapon and the implement of the modern as of the ancient savage; that the former turns the bones of the kangaroo and of the emu to the same account as the latter did the bones of the deer and the urus ; that the Australian heaps up the shells of devoured shellfish in mounds which represent the " refuse-heaps" or " Kjokkenmb'ddings," of Den mark ; and, finally, that, on the other side of Torres Straits, a race akin to the Australians are among the few people who now build their houses on pile-works, like those of the ancient Swiss lakes. ' That this amount of resemblance in habit and in the conditions of existence is accompanied by as close a resemblance in cranial con figuration, illustrates on a great scale that what Ciivier demonstrated of the animals of the Nile valley is no less true of men ; circum stances remaining similar, the savage varies little more, it would seem, than the ibis or the crocodile, especially if we take into ac count the enormous extent of the time over which our knowledge of man now extends, as compared with that measured by the duration of the sepulchres of Egypt. k Finally, the comparatively large cranial capacity of the Neander thal skull, overlaid though it may be by pithecoid bony walls, and the completely human proportions of the accompanying limb-bones, together with the very fair development of the Engis skull, clearly indicate that the first traces of the primordial stock whence man has proceeded need no longer be sought, by those who entertain any form of the doctrine of progressive development, in the newest tertiaries ; but that they may be looked for in an epoch more distant from the age of the Elephas primigenius than that is from us.' The two skulls which form the subject of the preceding comments and illustrations have given rise to nearly an equal amount of surprise for opposite reasons ; that of Engis because being so unequivocally ancient, it approached so near to the highest or Caucasian type ; that of the Neander thal, because, having no such decided claims to antiquity, it departs so widely from the normal standard of humanity. 90 COMPARISON OF THE CHAP. v. Professor Huxley's observation regarding the wide range of variation, both as to shape and capacity, in the skulls of so pure a race as the native Australian, removes to no small extent this supposed anomaly, assuming what though not proved is very probable, that both varieties coexisted in the post-pliocene period in Western Europe. As to the Engis skull, we must remember that although associated with the elephant, rhinoceros, bear, tiger, and hyaena, all of extinct species, it nevertheless is also accom panied by a bear, stag, wolf, fox, beaver, and many other quadrupeds of species still living. Indeed many eminent palaeontologists, and among them Professor Pictet, think that, numerically considered, the larger portion of the mammalian fauna agrees specifically with that of our own period, so that we are scarcely entitled to feel surprised if we find human races of the post-pliocene epoch undistinguishable from some living ones. It would merely tend to show that man has been as constant in his osteological characters as many other mammalia now his contemporaries. The expectation of always meeting with a lower type of human skull, the older the formation in which it occurs, is based on the theory of progressive development, and it may prove to be sound ; nevertheless we must remember that as yet we have no dis tinct geological evidence that the appearance of what are called the inferior races of mankind has always preceded in chronological order that of the higher races. It is now admitted that the differences between the brain of the highest races of man and that of the lowest, though less in degree, are of the same order as those which separate the human from the simian brain;* and the same rule holds good in regard to the shape of the skull. The average Negro skull differs from that of the European in having a * Natural History Keview, 1861, p. 8. CHAP. v. HUMAN AND SIMIAN BRAINS. 91 more receding forehead, more prominent superciliary ridges, and more largely developed prominences and furrows for the attachment of muscles ; the face also, and its lines, are larger proportionally. The brain is somewhat less voluminous on the average in the lower races of mankind, its convolu tions rather less complicated, and those of the two hemi spheres more symmetrical, in all which points an approach is made to the simian type. It will also be seen, by reference to the late Dr. Morton's works, and by the foregoing state ments of Professor Huxley, that the range of capacity between the highest and lowest human brain is far greater than that between the highest simian and lowest human brain; but the Neanderthal skull, although in several respects it is more ape-like than any human skull previously discovered, is, in regard to capacity, by no means contemptible. Eminent anatomists have shown that in the average pro portions of some of the bones the Negro differs from the European, and that in most of these characters, he makes a slightly nearer approach to the anthropoid quadrumana;* but Professor Schaaffhausen has pointed out that in these * ' The inferior races of mankind relatively, a little longer ; the foot is exhibit proportions which are in many an eighth, and the hand a twelfth respects intermediate between the longer than in the European. It is higher, or European, orders, and the well known that the foot is less well monkeys. In the Negro, for instance, formed in the Negro than in the the stature is less than in the Euro- European. The arch of the instep, pean. The cranium, as is well known, the perfect conformation of which is bears a small proportion to the face. essential to steadiness and ease of Of the extremities the upper are pro- gait, is less elevated in the former portionately longer, and there is, in than in the latter. The foot is both upper and lower, a less marked thereby rendered flatter as well as preponderance of the proximal over the longer, more nearly resembling the distal segments. For instance, in the monkey's, between which and the Negro, the thigh and arm are rather European, there is a marked differ- shorter than in the European ; the leg ence in this particular.' From ' A is actually of equal length in both Treatise on the Human Skeleton' by races, and is therefore, relatively, a Dr. Humphry, Lecturer on Surgery little longer in the Negro ; the fore-arm and Anatomy in the Cambridge Uni- in the latter is actually, as well as versity Medical School, p. 91 92 COMPAEISON OF THE HUMAN AND SIMIAN BRAINS. CHAP. v. proportions the Neanderthal skeleton does not differ from the ordinary standard, so that the skeleton by no means indicates a transition between Homo and Pithecus. There is doubtless, as shown in the diagram fig. 4, a nearer resemblance in the outline of the Neanderthal skull to that of a chimpanzee than had ever been observed before in any human cranium ; and Professor Huxley's description of the occipital region shows that the resemblance is not confined to the mere excessive prominence of the superciliary ridges. The direct bearing of the ape-like character of the Nean derthal skull on Lamarck's doctrine of progressive develop ment and transmutation, or on that modification of it which has of late been so ably advocated by Mr. Darwin, consists in this, that the newly observed deviation from a normal standard of human structure is not in a casual or random direction, but just what might have been anticipated if the laws of variation were such as the transmutationists require. For if we conceive the cranium to be very ancient, it exem plifies a less advanced stage of progressive development and improvement. If it be a comparatively modern race, owing its peculiarities of conformation to degeneracy, it is an illustration of what the botanists have called ' atavism,' or the tendency of varieties to revert to an ancestral type, which type, in proportion to its antiquity, would be of lower grade. To this hypothesis, of a genealogical connection between man and the lower animals, I shall again allude in the concluding chapters. CHAP. VI. POST-PLIOCENE ALLUVIUM. 93 CHAPTEK VI. POST-PLIOCENE ALLUYIUM AND CAYE DEPOSITS WITH FLINT IMPLEMENTS. GENERAL POSITION OF DRIFT WITH EXTINCT MAMMALIA IN VALLEYS DISCOVERIES OF M. BOUCHER DE PERTHES AT ABBEVILLE FLINT IMPLEMENTS FOUND ALSO AT ST. ACHEUL, NEAR AMIENS CURIOSITY AWAKENED BY THE SYSTEMATIC EXPLORATION OF THE BRIXHAM CAVE FLINT KNIVES IN SAME, WITH BONES OF EXTINCT MAMMALIA SUPER POSITION OF DEPOSITS IN THE CAVE VISITS OF ENGLISH AND FRENCH GEOLOGISTS TO ABBEVILLE AND AMIENS. Post-pliocene Alluvium containing Flint Implements in the Valley of the Somme. mHRpUGrHOUT a large part of Europe we find at mode- -L rate elevations above the present river-channels, usually at a height of less than forty feet but sometimes much higher, beds of gravel, sand, and loam containing bones of the elephant, rhinoceros, horse, ox, and other quadrupeds, some of extinct, others of living, species, belonging for the most part to the fauna already alluded to in the last chapter as characteristic of the interior of caverns. The greater part of these deposits contain fluviatile shells, and have un doubtedly been accumulated in ancient river-beds. These old channels have long since been dry, the streams which once flowed in them having shifted their position, deepening the valleys, and often widening them on one side. It has naturally been asked, if man coexisted with the extinct species of the caves, why were his remains and the works of his hands never embedded outside the caves in ancient river-gravel containing the same fossil fauna ? Why should it be necessary for the geologist to resort for evidence 94 POST-PLIOCENE ALLUVIUM OF THE SOMME. CHAP. vi. of the antiquity of our race to the dark recesses of under ground vaults and tunnels, which may have served as places of refuge or sepulture to a succession of human beings and wild animals, and where floods may have confounded to gether in one breccia the memorials of the fauna of more than one epoch ? Why do we not meet with a similar as semblage of the relics of man, and of living and extinct quadrupeds, in places where the strata can be thoroughly scrutinised in the light of day ? Recent researches have at length demonstrated that such memorials, so long sought for in vain, do in fact exist, and their recognition is the chief cause of the more favourable reception now given to the conclusions which MM. Tournal, Christol, Schmerling, and others, arrived at thirty years ago respecting the fossil contents of caverns. The first great step in this new direction was made thirteen years after the publication of Schmerling's ( Re searches,' by M. Boucher de Perthes, who found in ancient alluvium at Abbeville, in Picardy, some flint implements, the relative antiquity of which was attested by their geologi cal position. The antiquarian knowledge of their discoverer enabled him to recognise in their rude and peculiar type a character distinct from that of the polished stone weapons of a later period, usually called * celts.' In the first volume of his f Antiquites Celtiques,' published in 1847, M. Boucher de Perthes styled these older tools ( antedilu vian,' because they came from the lowest beds of a series of ancient alluvial strata bordering the valley of the Somme, which geologists had termed ' diluvium.' He had begun to collect these implements in 1841, from which time they had been dug out of the drift or deposits of gravel and sand whenever excavations were made in repairing the fortifica tions of Abbeville ; or annually, as often as flints were wanted for the roads, or loam for making bricks. Fine sections, CHAP. vi. DISCOVERIES OF M. BOUCHER DE PERTHES. 95 therefore, were laid open, from twenty to thirty-five feet in depth, and the bones of quadrupeds of the genera elephant, rhinoceros, bear, hysena, stag, ox, horse, and others, were found, and had been sent from time to time to Paris to be examined and named by Cuvier, who described them in his ' Ossements Fossiles.' A correct account of the associated flint tools and of their position was given in 1847 by M. Boucher de Perthes in his work above cited, and they were stated to occur at various depths, often twenty or thirty feet from the surface, in sand and gravel, especially in those strata which were nearly in contact with the subjacent white chalk. But the scientific world had no faith in the state ment that works of art, however rude, had been met with in undisturbed beds of such antiquity. Few geologists visited Abbeville in winter, when the sand-pits were open, and when they might have opportunities of verifying the sections, and judging whether the instruments had really been embedded by natural causes in the same strata with the bones of the mammoth, rhinoceros, and other extinct mammalia. Some of the tools figured in the e Antiquites Celtiques ' were so rudely shaped, that many imagined them to have owed their peculiar forms to accidental fracture in a river's bed ; others suspected frauds on the part of the workmen, who might have fabricated them for sale, or that the gravel had been disturbed, and that the worked flints had got mingled with the bones of the mammoth long after that animal and its associates had disappeared from the earth. No one was more sceptical than the late eminent physician of Amiens, Dr. Eigollot, who had long before (in the year 1819) written a memoir on the fossil mammalia of the valley of the Somme. He was at length induced to visit Abbe ville, and, having inspected the collection of M. Boucher de Perthes, returned home resolved to look for himself for flint tools in the gravel-pits near Amiens. There, accordingly, at 90 EXPLORATIONS OF THE BRIXHAM CAVE. CHAP. vi. a distance of about forty miles from Abbeville, he imme diately found abundance of similar flint implements, precisely the same in the rudeness of their make, and the same in their geological position ; some of them in gravel nearly on a level with the Somme, others in similar deposits resting on chalk at a height of about ninety feet above the river. Dr. Eigollot having in the course of four years obtained several hundred specimens of these tools, most of them from St. Acheul in the south-east suburbs of Amiens, lost no time in communicating an account of them to the scientific world, in a memoir illustrated by good figures of the worked flints and careful sections of the beds. These sections were executed by M. Buteux, an engineer well qualified for the task, who had written a good description of the geology of Pi- cardy. Dr. Eigollot, in this memoir, pointed out most clearly that it was not in the vegetable soil, nor in the brick-earth with land and fresh- water shells next below, but in the lower beds of coarse flint-gravel, usually twelve, twenty, or twenty-five feet below the surface, that the implements were met with, just as they had been previously stated by M. Boucher de Perthes to occur at Abbeville. The conclusion, therefore, which was legitimately deduced from all the facts, was that the flint tools and their fabricators were coeval with the extinct mam malia embedded in the same strata. Brixham Cave, near Torquay, Devonshire. Four years after the appearance of Dr. Eigollot's paper, a sudden change of opinion was brought about in England respecting the probable coexistence, at a former period, of man and many extinct mammalia, in consequence of the results obtained from a careful exploration of a cave at Brixham, near Torquay, in Devonshire. As the new views very generally adopted by English geologists had no small HAP. vi. EXPLORATIONS OF THE BRIXHAM CAVE. 97 influence on the subsequent progress of opinion in France, I shall interrupt my account of the researches made in the Valley of the Somme, by a brief notice of those which were carried on in 1858 in Devonshire with more than usual care and scientific method. Dr. Buckland, in his celebrated work, entitled ( KeliquiaB Diluvianse,' published in 1823, in which he treated of the organic remains con tained in caves, fissures, and ' diluvial gravel ' in England, had given a clear statement of the results of his own original observations, and had declared that none of the human bones or stone implements met with by him in any of the caverns could be considered to be as old as the mammoth and other extinct quadrupeds. Opinions in harmony with this con clusion continued until very lately to be generally in vogue in England ; although about the time that Schmerling was exploring the Liege caves, the Eev. Mr. M'Enery, a Eoman Catholic priest, residing near Torquay, had found in a cave one mile east of that town, called ' Kent's Hole,' in red loam covered with stalagmite, not only bones of the mammoth, tichorhine rhinoceros, cave-bear, and other mammalia, but several remarkable flint tools, some of which he supposed to be of great antiquity, while there were also remains of man in the same cave of a later date.* About ten years afterwards, in a < Memoir on the Greology of South Devon,' published in 1842 by the Geological Society of London, f an able geologist, Mr. Grodwin-Austen, de clared that he had obtained in the same cave (Kent's Hole) * The MS. and plates prepared for ments of an antique type and the a joint memoir on Kent's Hole, by bones of extinct animals. Two of Mr. M'Enery and Dr. Buckland, have these implements from Kent's Hole, recently been published by Mr. Vivian figured in Plate 12 of the posthumous of Torquay, from which, as well as work above alluded to, approach from some of the unprinted MS., I very closely in form and size to the infer that Mr. M'Enery only refrained common Abbeville implements, out of deference to Dr. Buckland from f Transactions of Geological So- declaring his belief in the contempo- eiety, 2nd series, vol. vi. p. 444. raneousness of certain flint imple- 98 EXPLORATIONS OF THE BRIXHAM CAYE. CHAP, vi. works of man from undisturbed loam or clay, under stalag mite, mingled with the remains of extinct animals, and that all these must have been introduced e before the stalagmite flooring had been formed.' He maintained that such facts could not be explained away by the hypothesis of sepulture, as in Dr. Buckland's well-known case of the human skeleton of Paviland, because in the Devon cave the flint implements were widely distributed through the loam, and lay beneath the stalagmite. As the osseous and other contents of Kent's Hole had, by repeated diggings, been thrown into much confusion, it was thought desirable in 1858, when the entrance of a new and intact bone-cave was discovered at Brixham, three or four miles west of Torquay, to have a thorough and systematic examination made of it. The Eoyal Society made two grants towards defraying the expenses,* and a committee of geologists was charged with the investigations, among whom Mr. Prestwich and Dr. Falconer took an active part, visiting Torquay while the excavations were in progress under the superintendence of Mr. Pengelly. The last-mentioned geo logist had the kindness to conduct me through the sub terranean galleries after they had been cleared out in 1859 ; and I saw, in company with Dr. Falconer, the numerous fossils which had been taken from the subterranean fissures and tunnels, all labelled and numbered, with references to a journal kept during the progress of the work, and in which the geological position of every specimen was recorded with scrupulous care. The discovery of the existence of this suite of caverns near the sea at Brixham was made accidentally by the roof of one of them falling in. None of the five external openings now exposed to view in steep cliffs or the sloping side of a * When these grants failed, Miss quay, liberally supplied the funds for Burdett Coutts, then residing at Tor- completing the work. CHAP. vi. EXPLORATIONS OF THE BRIXHAM CAYE. 99 valley were visible before the breccia and earthy matter which blocked them up were removed during the late exploration. According to a ground-plan drawn up by Professor Kamsay, it appears that some of the passages which run nearly north and south are fissures connected with the vertical dislocation of the rocks, while another set, running nearly east and west, are tunnels, which have the appearance of having been to a great extent hollowed out by the action of running water. The central or main entrance, leading to what is called the f reindeer gallery,' because a perfect antler of that animal was found sticking in the stalagmitic floor, is ninety-five feet above the level of the sea, being also about sixty above the bottom of the adjoining valley. The united length of the five galleries which were cleared out amounted to several hundred feet. Their width never exceeded eight feet. They were sometimes filled up to the roof with gravel, bones, and mud, but occasionally there was a considerable space between the roof and floor. The latter, in the case of the fissure-caves, was covered with stalagmite, but in the tunnels it was usually free from any such incrustation. The following was the general succession of the deposits forming the contents of the underground passages and channels : 1st. At the top, a layer of stalagmite varying in thick ness from one to fifteen inches, which sometimes contained bones, such as the reindeer's horn, already mentioned, and an entire humerus of the cave-bear. 2ndly. Next below, loam or bone-earth, of an ochreous red colour, from one foot to fifteen feet in thickness. Srdly. At the bottom of all, gravel with many rounded pebbles in it, probed in some places to the depth of twenty feet without its being pierced through, and as it was barren of fossils, left for the most part unremoved. The mammalia obtained from the bone-earth consisted of 100 FLINT KNIVES IN BEIXHAM CAYE. CHAP. VI. Elephas primigenius, or mammoth ; Rhinoceros tichorhinus ; Ursus spelceus ; Hycena spelcea ; Felis spelcea, or the cave- lion ; Cervus Tarandus, or the reindeer ; a species of horse, ox, and several rodents, and others not yet determined. No human bones were obtained anywhere during these excavations, but many flint knives, chiefly from the lowest part of the bone-earth ; and one of the most perfect lay at the depth of thirteen feet from the surface, and was covered with bone-earth of that thickness. From a similar position was taken one of those siliceous nuclei, or cores, from which flint flakes had been struck off on every side. Neglecting the less perfect specimens, some of which were met with even in the lowest gravel, about fifteen knives, recognised as artificially formed by the most experienced antiquaries, were taken from the bone-earth, and usually from near the bottom. Such knives, considered apart from the associated mammalia, afford in themselves no safe criterion of antiquity, as they might belong to any part of the age of stone, similar tools being sometimes met with in tumuli posterior in date to the era of the introduction of bronze. But the anteriority of those at Brixham to the extinct animals is demonstrated not only by the occurrence at one point in overlying stalagmite of the bone of a cave-bear, but also by the discovery at the same level in the bone-earth, and in close proximity to a very perfect flint tool, of the entire left hind-leg of a cave- bear. This specimen, which was shown me by Dr. Falconer and Mr. Pengelly, was exhumed from the earthy deposit in the reindeer gallery, near its junction with the flint-knife gallery, at the distance of about sixty-five feet from the main entrance. The mass of earth containing it was removed entire, and the matrix cleared away carefully by Dr. Fal coner in the presence of Mr. Pengelly. Every bone was in its natural place, the femur, tibia, fibula, ankle-bone, or astragalus, all in juxta-position. Even the patella or de- CHAP. vi. BRIXHAM CAVE DEPOSITS. 101 tached bone of the knee-pan was searched for, and not in vain. Here, therefore, we have evidence of an entire limb not having been washed in a fossil state out of an older alluvium, and then swept afterwards into a cave, so as to be mingled with flint implements, but having been introduced when clothed with its flesh, or at least when it had the separate bones bound together by their natural ligaments, and in that state buried in mud. If they were not all of contemporary date, it is clear from this case, and from the humerus of the Ursus spelceus, before cited, as found in a floor of stalagmite, that the bear lived after the flint tools were manufactured, or in other words, that man in this district preceded the cave-bear. A glance at the position of the Brixham limestone con taining the ossiferous caverns and fissures, and a brief survey of the valleys which bound it on two sides, are enough to satisfy a geologist that the drainage and geographical fea tures of this region have undergone great changes since the gravel and bone-earth were carried by streams into the sub terranean cavities above described. Some worn pebbles of hematite, in particular, can only have come from their nearest parent rock, at a period when the valleys imme diately adjoining the caves were much shallower than they now are. The reddish loam in which the bones are em bedded is such as may be seen on the surface of limestone in the neighbourhood, but the currents which were formerly charged with such mud must have run at a level sixty feet above that of the stream now flowing in the same valley. It was remarked by Mr. Pengelly, that the pebbles in the gravel and the bones in the loam had their longer axes parallel to the direction of the tunnels and fissures, showing that they were deposited by the action of a stream. It appears that so long as the flowing water had force enough to propel stony fragments, no layer of fine mud could 102 INVESTIGATIONS MADE AT ABBEYILLE AND AMIENS. CHAP. vi. accumulate, and so long as there was a regular current capable of carrying in fine mud and bones, no superficial crust of stalagmite. In some passages, as before stated, sta lagmite was wanting, while in one place five alternations of stalagmite and sand were observed, seeming to indicate a prevalence of more rainy seasons, succeeded by others, when the water was for a time too low to flood the area where the calcareous incrustation accumulated. If the regular sequence of the three deposits of pebbles, mud, and stalagmite was the result of the causes above explained, the order of superposition would be constant, yet we could not be sure that the gravel in one passage might not sometimes be coeval with the bone-earth or stalag mite in another. If therefore the flint knives had not been very widely dispersed, and if one of them had not been at the bottom of the bone-earth, close to the leg of the bear above described, their antiquity relatively to the extinct mammalia might have been questioned. No coprolites were found in the Brixham excavations, and very few gnawed bones. These few may have been brought from some distance, before they reached their place of rest. Upon the whole, the same con clusion which Dr. Schmerling came to, respecting the filling up of the caverns near Liege, seems applicable to the caves of Brixham. Dr. Falconer, after aiding in the investigations above al luded to near Torquay, stopped at Abbeville on his way to Sicily, in the autumn of 1858, and saw there the collection of M. Boucher de Perthes. Being at once satisfied that the flints called hatchets had really been fashioned by the hand of man, he urged Mr. Prestwich, by letter, thoroughly to explore the geology of the Valley of the Somme. This he accordingly accomplished, in company with Mr. John Evans, of the Society of Antiquaries, and, before his return that same year, CHAP. vi. INVESTIGATIONS MADE AT ABBEVILLE AND AMIENS. 103 succeeded in dissipating all doubts from the minds of his geo logical friends by extracting, with his own hands, from a bed of undisturbed gravel, at St. Acheul, a well-shaped flint hatchet. This implement was buried in the gravel at a depth of seven teen feet from the surface, and was lying on its flat side. There were no signs of vertical rents in the enveloping matrix, nor in the overlying beds of sand and loam, in which were many land and fresh-water shells ; so that it was impossible, to ima gine that the tool had gradually worked its way downwards, as some had suggested, through the incumbent soil, into an older formation.* There was no one in England whose authority deserved to have more weight in overcoming incredulity in regard to the antiquity of the implements in question than that of Mr. Prestwich, since, besides having published a series of important memoirs on the tertiary formations of Europe, he had devoted many years specially to the study of the drift and its organic remains. His report, therefore, to the Eoyal Society, accompanied by a photograph showing the position of the flint tool in situ before it was removed from its matrix, not only satisfied many inquirers, but induced others to visit Abbeville and Amiens ; and one of these, Mr. Flower, who accompanied Mr. Prestwich on his second excursion to St. Acheul, in June 1859, succeeded, by digging into the bank of gravel, in disinterring, at the depth of twenty-two feet from the surface, a fine, symmetrically shaped weapon of an oval form, tying in and beneath strata which were ob served by many witnesses to be perfectly undisturbed.f Shortly afterwards, in the year 1859, I visited the same pits, and obtained seventy flint tools, one of which was taken out while I was present, though I did not see it before it had * Prestwich, Proceedings of the f Geological Quarterly Journal, Royal Society, 1859, and Philoso- vol. xvi. p. 190. phical Transactions, 1860. 104 INVESTIGATIONS MADE AT ABBEVILLE AND AMIENS. CHAP. vi. fallen from the matrix. I expressed my opinion in favour of the antiquity of the flint tools to the meeting of the British Association at Aberdeen, in the same year.* On my way through Eouen, I stated my convictions on this subject to Mr. George Pouchet, who immediately betook himself to St. Acheul, commissioned by the municipality of Eouen, and did not quit the pits till he had seen one of the hatchets extracted from gravel in its natural position, f M. Gaudry also gave the foil owing account of his researches in the same year to the Eoyal Academy of Sciences at Paris. ( The great point was not to leave the workmen for a single instant, and to satisfy oneself by actual inspection, whether the hatchets were found in situ. I caused a deep excavation to be made, and found nine hatchets, most distinctly in situ in the diluvium, associated with teeth of Equus fossilis and a species of Bos, different from any now living, and similar to that of the diluvium and of caverns.'J In 1859, M. Hebert, an original observer of the highest authority, declared to the Geological Society of France that he had, in 1854, or four years before Mr. Prestwich's visit to St. Acheul, seen the sections at Abbeville and Amiens, and had come to the opinion that the hatchets were imbedded in the ' lower di luvium,' and that their origin was as ancient as that of the mammoth and the rhinoceros. M. Desnoyers also made excavations after M. Gaudry, at St. Acheul, in 1859, with the same results. After a lively discussion on the subject in England and France, it was remembered, not .only that there were nume rous recorded cases leading to similar conclusions in regard to cavern deposits, but, also, that Mr. Frere had, so long ago as * See Proceedings of British Asso- | Comptes rendus, September 26th, ciation for 1859. and October 3rd, 1859. f Actes du Musee d'Histoire Natu- Bulletin, vol. xvii. p. 18. relle de Eouen, 1860, p. 33. CHAP. vi. INVESTIGATIONS MADE AT ABBEVILLE AND AMIENS. 105 1797, found flint weapons, of the same type as those of Amiens, in a fresh-water formation in Suffolk, in conjunction with elephant remains ; and nearly a hundred years earlier (1715), another tool of the same kind had been exhumed from the gravel of London, together with bones of an elephant ; to all which examples I shall allude more fully in the sequel. I may conclude this chapter by quoting a saying of Pro fessor Agassiz, 'that whenever a new and startling fact is brought to light in science, people first say, " it is not true," then that " it is contrary to religion," and lastly, " that every body knew it before." ' If I were considering merely the cultivators of geology, I should say that the doctrine of the former co-existence of man with many extinct mammalia had already gone through these three phases in the progress of every scientific truth towards acceptance. But the grounds of this belief have not yet been fully laid before the general public, so as to enable them fairly to weigh and appreciate the evidence. I shall therefore do my best in the next three chapters to accomplish this task. 106 GEOLOGICAL DESCRIPTION OF THE SOMME YALLEY. CHAP. vn. CHAPTER VII. PEAT AND POST-PLIOCENE ALLUVIUM OF THE YALLEY OF THE SOMME. GEOLOGICAL STRUCTURE OF THE VALLEY OF THE SOMME AND OF THE SURROUNDING COUNTRY POSITION OF ALLUVIUM OF DIFFERENT AGES PEAT NEAR ABBEVILLE ITS ANIMAL AND VEGETABLE CON TENTS WORKS OF ART IN PEAT PROBABLE ANTIQUITY OF THE PEAT, AND CHANGES OF LEVEL SINCE ITS GROWTH BEGAN FLINT IMPLEMENTS OF ANTIQUE TYPE IN OLDER ALLUVIUM THEIR VARIOUS FORMS AND GREAT NUMBERS. Geological Structure of the Somme Valley. rFHE Valley of the Somme in Picardy, alluded to in the last J- chapter, is situated geologically in a region of white chalk with flints, the strata of which are nearly horizontal. The chalk hills which hound the valley are almost everywhere between 200 and 300 feet in height. On ascending to that ele vation, we find ourselves on an extensive table-land, in which there are slight elevations and depressions. The white chalk itself is scarcely ever exposed at the surface on this plateau, although seen on the slopes of the hills, as at b and c (fig, 7 ). The general surface of the upland region is covered continu ously for miles in every direction by loam or brick-earth (No. 4), about five feet thick, devoid of fossils. To the wide extent of this loam the soil of Picardy chiefly owes its great fertility. Here and there we also observe, on the chalk, outlying patches of tertiary sand and clay (No. 5, fig. 7), with eocene fossils, the remnants of a formation once more extensive, and which probably once spread in one continuous mass over the chalk, before the present system of valleys had begun to be shaped out. It is necessary to allude to these relics of CHAP. VII. GEOLOGICAL DESCRIPTION OP THE SOMME VALLEY. 107 tertiary strata, of which the larger part is missing, because their denudation has contributed largely to furnish the materials of gravels in which the flint implements and bones of extinct mammalia are entombed. From this source have been derived not only the regular-formed egg- shaped pebbles, so common in the old fluviatile alluvium at all levels, but those huge masses of hard sandstone, several feet in diameter, to which I shall allude in the sequel. The upland loam also (No. 4) has often, in no slight degree, been formed at the expense of the same tertiary sands and clays, as is attested by its becoming more or less sandy or argillaceous, according to the nature of the nearest eocene outlier in the neighbourhood. Fig. 7 Section across the Valley of the Somme in Picardy. 1 Peat, twenty to thirty feet thick, resting on gravel, a. 2 Lower level gravel with elephants' bones and flint tools, covered with fluviatile loam, twenty to forty feet thick. 3 Upper level gravel with similar fossils, and with overlying loam, in all thirty feet thick. 4 Upland loam without shells (Limon des plateaux), five or six feet thick. 5 Eocene tertiary strata, resting on the chalk in patches. The average width of the Valley of the Somme between Amiens and Abbeville is one mile. The height, therefore, of the hills, in relation to the river-plain, could not be correctly represented in the annexed diagram (fig. 7), the hills having been reduced to one fourth of their altitude. It would other wise have been necessary to make the space between c and b four times as great. The dimensions also of the masses of drift or alluvium, 2 and 3, have been exaggerated, in order to render them sufficiently conspicuous ; for, all important as we shall find them to be as geological monuments of the post- pliocene period, they form a truly insignificant feature in the 108 PEAT OF THE VALLEY OF THE SOMME. CHAP. vn. general structure of the country, so much so, that they might easily be overlooked in a cursory survey of the district, and are usually unnoticed in geological maps not specially devoted to the superficial formations. It will be seen by the description given of the section, fig. 7, that No. 2 indicates the lower level gravels, and No. 3 the higher ones, or those rising to elevations of eighty or a hundred feet above the river. Newer than these is the peat No. 1, which is from ten to thirty feet in thickness, and which is not only of later date than the alluvium, 2 and 3, but is also posterior to the denudation of those gravels, or to the time when the valley was excavated through them. Underneath the peat is a bed of gravel, a, from three to fourteen feet thick, which rests on undisturbed chalk. This gravel was probably formed, in part at least, when the valley was scooped out to its present depth, since which time no geological change has taken place, except the growth of the peat, and certain oscillations in the general level of the country, to which we shall allude by and by. A thin layer of impervious clay separates the gravel a from the peat No. 1, and seems to have been a necessary pre liminary to the growth of the peat. Peat of the Valley of the Somme. As hitherto, in our retrospective survey, we have been obliged, for the sake of proceeding from the known to the less known, to reverse the natural order of history, and to treat of the newer before the older formations, I shall begin my account of the geological monuments of the Valley of the Somme by saying something of the most modern of all of them, the peat. This substance occupies the lower parts of the valley far above Amiens, and below Abbeville as far as the sea. It has already been stated to be in some places thirty feet thick, and is even occasionally more than thirty feet, CHAP. vii. PEAT OF ABBEVILLE. 109 corresponding in that respect to the Danish mosses before de scribed (Ch. II.). Like them, it belongs to the recent period ; all the embedded mammalia, as well as the shells, being of the same species as those now inhabiting Europe. The bones of quadrupeds are very numerous, as I can bear witness, having seen them brought up from a considerable depth near Abbeville, almost as often as the dredging instrument was used. Besides remains of the beaver, I was shown, in the col lection of M. Boucher de Perthes, two perfect lower jaws with teeth of the bear, Ursus Arctos ; and in the Paris Museum there is another specimen, also from the Abbeville peat. The list of mammalia already comprises a large proportion of those proper to the Swiss lake-dwellings, and to the shell- mounds and peat of Denmark ; but unfortunately as yet no special study has been made of the French fauna, like that by which the Danish and Swiss zoologists and botanists have enabled us to compare the wild and tame animals and the vegetation of the age of stone with that of the age of iron. Notwithstanding the abundance of mammalian bones in the peat, and the frequency of stone implements of the Celtic and Gallo-Eoman periods, M. Boucher de Perthes has only met with three or four fragments of human skeletons. At some depth in certain places in the valley near Abbe ville, the trunks of alders have been found standing erect as they grew, with their roots fixed in an ancient soil, afterwards covered with peat. Stems of the hazel, and nuts of the same, abound ; trunks, also, of the oak and walnut. The peat extends to the coast, and is there seen passing under the sand-dunes and below the sea-level. At the mouth of the river Canche, which joins the sea near the embouchure of the Somme, yew trees, firs, oaks, and hazels have been dug out of peat, which is there worked for fuel, and is about three feet thick.* During great storms, large masses of compact * D'Archiac, Hist, des Progres, vol. ii. p. 154. 110 PROBABLE ANTIQUITY OF PEAT. CHAP. vn. peat, enclosing trunks of flattened trees, have been thrown up on the coast at the mouth of the Somme; seeming to indicate that there has been a subsidence of the land and a consequent submergence of what was once a westward con tinuation of the Valley of the Somme into what is now a part of the British Channel, or La Manche. Whether the vegetation of the lowest layers of peat differed as to the geographical distribution of some of the trees from the middle, and this from the uppermost peat, as in Denmark, has not yet been ascertained ; nor have careful observations been made with a view of calculating the minimum of time which the accumulation of so dense a mass of vegetable matter must have taken. A foot in thickness of highly compressed peat, such as is sometimes reached in the bottom of the bogs, is obviously the equivalent in time of a much greater thickness of peat of spongy and loose texture, found near the surface. The workmen who cut peat, or dredge it up from the bottom of swamps and ponds, declare that in the course of their lives none of the hollows which they have found, or caused by ex tracting peat, have ever been refilled, even to a small extent. They deny, therefore, that the peat grows. This, as M. Boucher de Perthes observes, is a mistake ; but it implies that the increase in one generation is not very appreciable by the unscientific. The antiquary finds near the surface Grallo-Eoman remains, and still deeper Celtic weapons of the stone period. But the depth at which Roman works of art occur varies in different places, and is no sure test of age ; because in some parts of the swamps, especially near the river, the peat is often so fluid that heavy substances may sink through it, carried down by their own gravity. In one case, however, M. Boucher de Perthes observed several large flat dishes of Roman pottery, lying in a horizontal position in the peat, the shape of which must have prevented them from sinking or penetrating CHAP. \ii. CHANGES OF LEVEL. Ill through the underlying peat. Allowing about fourteen cen turies for the growth of the superincumbent vegetable matter, he calculated that the thickness gained in a hundred years would be no more than three French centimetres.* This rate of increase would demand so many tens of thousands of years for the formation of the entire thickness of thirty feet, that we must hesitate before adopting it as a chronometric scale. Yet, by multiplying observations of this kind, and bringing one to bear upon and check another, we may eventually suc ceed in obtaining data for estimating the age of the peaty deposit. The rate of increase in Denmark may not be applicable to France ; because differences in the humidity of the climate, or in the intensity and duration of summer's heat and winter's cold, as well as diversity in the species of plants which most abound, would cause the peat to grow more or less rapidly, not only when we compare two distinct countries in Europe, but the same country at two successive periods. I have already alluded to some facts which favour the idea that there has been a change of level on the coast since the peat began to grow. This conclusion seems confirmed by the mere thickness of peat at Abbeville, and the occurrence of alder and hazel-wood near the bottom of it. If thirty feet of peat were now removed, the sea would flow up and fill the valley for miles above Abbeville. Yet this vegetable matter is all of submarine or fresh-water origin, for where aquatic shells occur in it they are all of terrestrial or fluviatile kinds, so that it must have grown above the sea-level when the land was more elevated than now. We have already seen what changes in the relative level of sea and land have oc curred in Scotland subsequently to the time of the Eomans, and are therefore prepared to meet with proofs of similar movements in Picardy. In that country they have probably * Antiquites Celtiques, vol. ii. p. 134. 112 FLINT IMPLEMENTS IN VALLEY OF THE SOMME. CHAP. vir. not been confined simply to subsidence, but have comprised oscillations in the level of the land, by which marine shells of the post-pliocene period have been raised some ten feet or more above the level of the sea. Small as is the progress hitherto made in interpreting the pages of the peaty record, their importance in the Valley of the Somme is enhanced by the reflection that, whatever be the number of centuries to which they relate, they belong to times posterior to the ancient implement-bearing beds, which we are next to consider, and are even separated from them, as we shall see, by an interval far greater than that which divides the earliest strata of the peat from the latest. Flint Implements of the Post-pliocene Period in the Valley of the Somme. The alluvium of the Valley of the Somme exhibits no thing extraordinary or exceptional in its position or external appearance, nor in the arrangement or composition of its materials, nor in its organic remains ; in all these cha racters it might be matched by the drift of a hundred other valleys in France or England. Its claim to our peculiar attention is derived from the wonderful number of flint tools, of a very antique type, which, as stated in the last chapter, occur in undisturbed strata, associated with the bones of extinct quadrupeds. As much doubt has been cast on the question, whether the so-called flint hatchets have really been shaped by the hands of man, it will be desirable to begin by satisfying the reader's mind on that point, before inviting him to study the details of sections of successive beds of mud, sand, and gravel, which vary considerably even in contiguous localities. Since the spring of 1859, I have paid three visits to the Valley of the Somme, and examined all the principal CHAP. vii. FLINT IMPLEMENTS IN VALLEY OF THE SOMME. 113 localities of these flint tools. In my excursions around Abbeville, I was accompanied by M. Boucher de Perthes, and during one of my explorations in the Amiens district, by Mr. Prestwich. The first time I entered the pits at St. Acheul, I obtained seventy flint instruments, all of them collected from the drift in the course of the preceding five or six weeks. The two prevailing forms of these tools are represented in the annexed figures 8 and 9, each of which are half the size of the originals ; the first being the spear-headed form, varying in length from six to eight inches ; the second, the oval form, which is not unlike some stone implements, used to this day as hatchets and tomahawks by natives of Australia, but with this difference, that the edge in the Australian weapons (as in the case of those called celts in Europe) has been produced by friction, whereas the cutting edge in the old tools of the Valley of the Somme was always gained by the simple fracture of the flint, and by the repetition of many dexterous blows. The oval-shaped Australian weapons, however, differ in being sharpened at one end only. The other, though reduced by fracture to the same general form, is left rough, in which state it is fixed into a cleft stick, which serves as a handle. To this it is firmly bound by thin straps of opossum's hide. One of these tools, now in my possession, was given me by Mr, Farquharson of Haughton, who saw a native using it in 1854, on the Auburn river, in Burnet district, North Australia. Out of more than a hundred flint implements which I obtained at St. Acheul, not a few had their edges more or less fractured or worn, either by use as instruments before they were buried in gravel, or by being rolled in the river's bed. Some of these tools were probably used as weapons, both of war and of the chase, others to grub up roots, cut down trees, and scoop out canoes. Some of them may have served, i 114 FLINT IMPLEMENTS IN VALLEY OF THE SOMME. CHAP. VII. Fig. 8 Flint implement from St. Acheul, near Amiens, of the spear-head shape. Fig. 8 Half the size of the original, which is seven and a half inches long. a Side view. b Same seen edgewise. These spear-headed implements have been found in greater number, pro portionally to the oval ones, in the upper level gravel at St. Acheul, than in any of the lower gravels in the valley of the Somme. In these last the oval form predominates, especially at Abbeville. CHAP. VII. FLINT IMPLEMENTS IN VALLEY OF THE SOMME. 115 Fig. 10 Flint implements from the Post-pliocene Drift of Abbeville and Amiens. Fig. 9 a Oval-shaped flint hatchet from Mautort, near Abbeville, half size of original, which is five and a half inches long, from a bed of gravel underlying the fluvio-marine stratum. b Same seen edgewise. c Shows a recent fracture of the edge of the same at the point a, or near the top. This portion of the tool, c, is drawn of the natural size, the black central part being the unaltered flint, the white outer coating, the layer which has been formed by discoloration or bleaching since the tool was first made. The entire surface of No. 9 must have been black when first shaped, and the bleaching to such a depth must have been the work of time, whether produced by exposure to the sun and air before it was embedded, or afterwards when it lay deep in the soil. Fig. 10. Flint tool from St. Acheul, seen edgewise; original, six and a half inches long, and three inches wide. b, c Portion not artificially shaped. b, a Part chipped into shape, and having a cutting edge at a. I 2 116 FLINT IMPLEMENTS IN VALLEY OF THE SOMME. CHAP. vn. as Mr. Prestwich has suggested, for cutting holes in the ice both for fishing and for obtaining water, as will be explained in the 8th chapter when we consider the arguments in favour of the higher level drift having belonged to a period when the rivers were frozen over for several months every winter. When the natural form of a chalk-flint presented a suitable handle at one end, as in the specimen, fig. 10, that part was left as found. The portion, for example, between b and c has probably not been altered ; the protuberances which are fractured having been broken off by river action before the flint was chipped artificially. The other ex tremity, a, has been worked till it acquired a proper shape and cutting edge. Many of the hatchets are stained of an ochreous-yellow colour, when they have been buried in yellow gravel, others have acquired white or brown tints, according to the matrix in which they have been enclosed. This accordance in the colouring of the flint tools with the character of the bed from which they have come, indicates, says Mr. Prestwich, not only a real derivation from such strata, but also a sojourn therein of equal duration to that of the naturally broken flints forming part of the same beds.* The surface of many of the tools is encrusted with a film of carbonate of lime, while others are adorned by those ramifying crystallisations called dendrites (see figs. 11 13), usually consisting of the mixed oxyds of iron and manganese, forming extremely delicate blackish brown sprigs, resembling the smaller kinds of sea weed. They are a useful test of antiquity when suspicions are entertained of the workmen having forged the hatchets which they offer for sale. The most general test, however, of the genuineness of the imple ments obtained by purchase is their superficial varnish-like or vitreous gloss, as contrasted with the dull aspect of freshly * Philosophical Transactions, 1861, p. 297. CHAP. vii. FLINT IMPLEMENTS IN VALLEY OF THE SOMME. 117 fractured flints. I also remarked, during each of my three visits to Amiens, that there were some extensive gravel-pits, such as those of Montiers and St. Roch, agreeing in their geological character with those of St. Acheul, and only a mile or two distant, where the workmen, although familiar with the forms, and knowing the marketable value of the articles above described, assured me that they had never been able to find a single implement. Fig. 12 Fig. 13 Dendrites on surfaces of flint hatchets in the drift of St. Acheul, near Amiens. Fig. 11, a Natural size. Fig. 12, b Natural size. c Magnified. Fig. 13, d Natural size, e Magnified. Respecting the authenticity of the tools as works of art, Professor Ramsay, than whom no one could be a more competent judge, observes : ' For more than twenty years, like others of my craft, I have daily handled stones, whether fashioned by nature or art ; and the flint hatchets of Amiens and Abbeville seem to me as clearly works of art as any Sheffield whittle.'* Mr. Evans classifies the implements under three heads, two of which, the spear heads and the oval or almond-shaped kinds, have already been described. The third form, fig. 14, consists of flakes, apparently intended for knives or some of the smaller ones for arrow heads. In regard to their origin, Mr. Evans observes that there is a uniformity of shape, a correctness of outline, and a sharpness about the cutting edges and points, which cannot be due to anything but design. f Of these knives and flakes, I obtained several specimens * Athenaeum, July 16, 1859. f Archseologica, voL xxxviii. 118 THEIR FORMS AND GREAT NUMBERS. CHA.P. vii. from a pit which I caused to be dug at Abbeville, in sand in contact with the chalk, and below certain fluvio-marine beds, which will be alluded to in the next chapter. Flint knife or flake from below the sand containing Cyrena flnminalis. Menchecourt, Abbeville. d Transverse section along the line of fracture, b, c. Size, two-thirds of the original. Between the spear-head and oval shapes, there are various intermediate gradations, and there are also a vast variety of very rude implements, many of which may have been rejected as failures, and others struck off as chips in the course of manufacturing the more perfect ones. Some of these chips can only be recognised by an experienced eye as bearing marks of human workmanship. It has often been asked, how, without the use of metallic hammers, so many of these oval and spear-headed tools could have been wrought into so uniform a shape. Mr. Evans, in order experimentally to illustrate the process, constructed a stone hammer, by mounting a pebble in a wooden handle, and with this tool struck off flakes from the edge on both sides of a chalk flint, till it acquired precisely the same shape as the oval tool, fig, 9,*p. 115. If I were invited to estimate the probable number of the more perfect tools found in the valley of the Somme since 1842, rejecting all the knives, and all that might be suspected of being spurious or forged, I should conjecture that they far exceeded a thousand. Yet it would be a great mistake to imagine that an antiquary or geologist, who should devote a few weeks to the exploration of such a valley as that of the CHAP. vn. GLOBULAR SPONGES ARTIFICIALLY PERFORATED. 119 Somme, would himself be able to detect a single specimen. But few tools were lying on the surface. The rest have been exposed to view by the removal of such a volume of sand, clay, and gravel, that the price of the discovery of one of them could only be estimated by knowing how many hundred labourers have toiled at the fortifications of Abbeville, or in the sand and gravel pits near that city, and around Amiens, for road materials and other economical purposes, during the last twenty years. In the gravel pits of St. Acheul, and in some others near Amiens, small round bodies, having a tubular cavity in the centre, occur. They are well known as fossils of the white chalk. Dr. Eigollot suggested that they might have been a, b Coscinopora globularis If Orb. Orbitolina concava Parker and Jones, c Part of the same magnified. strung together as beads, and he supposed the hole in the middle to have been artificial. Some of these round bodies are found entire in the chalk and in the gravel, others have naturally a hole passing through them, and sometimes one or two holes penetrating some way in from the surface, but not extending to the other side. Others, like 6, fig. 15, have a large cavity, which has a very artificial aspect. It is impossible to decide whether they have or have not served as personal ornaments, recommended by their globular form, lightness, and by being less destructible than ordinary chalk. Granting that there were natural cavities in the axis of some of them, it does not follow that these may not have been taken advantage of for stringing them as beads, while others may have been artificially bored through. Dr. Rigollot's 120 GLOBULAR SPONGES ARTIFICIALLY PERFORATED. CHAP. vn. argument in favour of their having been used as necklaces or bracelets, appears to me a sound one. He says he often found small heaps or groups of them in one place, all perforated, just as if, when swept into the river's bed by a flood, the bond which had united them together remained unbroken.* * Kigollot, M&noire sur des Instruments en Silex, &c. p. 16. Amiens, 1854. CHAP. vin. LOWER-LEVEL GRAVELS OF THE SOMME VALLEY. 121 CHAPTER VIII. POST-PLIOCENE ALLUVIUM WITH FLINT IMPLEMENTS OF THE VALLEY OF THE SOMME, Concluded. FLUVIO-MARINE STRATA, WITH FLINT IMPLEMENTS, NEAR ABBEVILLE MARINE SHELLS IN SAME CYRENA FLUMINALIS MAMMALIA ENTIRE SKELETON OF RHINOCEROS FLINT IMPLEMENTS, WHY FOUND LOW DOWN IN FLUVIATILE DEPOSITS RIVERS SHIFTING THEIR CHANNELS RELATIVE AGES OF HIGHER AND LOWER-LEVEL GRAVELS SECTION OF ALLUVIUM OF ST. ACHEUL TWO SPECIES OF ELEPHANT AND HIPPOPOTAMUS COEXISTING WITH MAN IN FRANCE VOLUME OF DRIFT, PROVING ANTIQUITY OF FLINT IMPLEMENTS ABSENCE OF HUMAN BONES IN TOOL-BEARING ALLUVIUM, HOW EXPLAINED VALUE OF CERTAIN KINDS OF NEGATIVE EVIDENCE TESTED THEREBY HUMAN BONES NOT FOUND IN DRAINED LAKE OF HAARLEM. IN the section of the valley of the Somme, given at p. 106 (fig. 7), the successive formations newer than the chalk are numbered in chronological order, beginning with the most modern, or the peat, which is marked No. 1, and which has been treated of in the last chapter. Next in the order of antiquity are the lower-level gravels No. 2, which we have now to describe; after which the alluvium, No. 3, found at higher levels, or about eighty and one hundred feet above the river-plain, will remain to be considered. I have selected, as illustrating the old alluvium of the Somme occurring at levels slightly elevated above the present river, the sand and gravel-pits of Menchecourt, in the north west suburbs of Abbeville, to which, as before stated, p. 94, attention was first drawn by M. Boucher de Perthes, in his work on Celtic antiquities. Here, although in every adjoin- *122 SECTION OF STEATA AT MENCHECOURT. CHAP. VIIT. ing pit some minor variations in the nature and thickness of the superimposed deposits may be seen, there is yet a general approach to uniformity in the series. The only stratum of which the relative age is somewhat doubtful, is the gravel marked a, underlying the peat, and resting on the chalk. It is only known by borings, and some of it may be of the same age as No. 3 ; but I believe it to be for the most part of more modern origin, consisting of the wreck of all the older gravel, including No. 3, and formed during the last hollowing out Fig. 16 Chalk ^ ^^ ^a** n 2 Somme .R !!!*^nnii = Sea, Level Chalk Section of fluvio-marine strata, containing flint implements and bones of extinct mammalia, at Menchecourt, Abbeville.* 1 Brown clay with angular flints, and occasionally chalk rubble, unstratified, following the slope of the hill, probably of subaerial origin, of very varying thickness, from two to five feet and upwards. 2 Calcareous loam, buff-coloured, resembling loess, for the most part un stratified, in some places with slight traces of stratification, containing freshwater and land shells, with bones of elephants, &c. ; thickness about fifteen feet. 3 Alternations of beds of gravel, marl, and sand, with freshwater and land shells, and in some of the lower sands, a mixture of marine shells ; also bones of elephant, rhinoceros, &c., and flint implements ; thickness about twelve feet. a Gravel underlying peat, age undetermined. b Layer of impervious clay, separating the gravel from the peat. and deepening of the valley immediately before the com mencement of the growth of peat. The greater number of flint implements have been dug out of No. 3, often near the bottom, and twenty-five, thirty, or even more than thirty feet below the surface of No. 1. * For detailed sections and maps of this district, seePrestwich, Philosophical Transactions, 1860, p. 277. CHAP. viil. MARINE SHELLS AT MENCHECOURT. 123 A geologist will perceive by a glance at the section that the valley of the Somme must have been excavated nearly to its present depth and width when the strata of No. 3 were thrown down, and that after the deposits Nos. 3, 2, and 1 had been formed in succession, the present valley was scooped out, patches only of Nos. 3 and 2 being left. For these deposits cannot originally have ended abruptly as they now do, but must have once been continuous farther towards the centre of the valley. To begin with the oldest, No. 3, it is made up of a suc cession of beds, chiefly of freshwater origin, but occasionally a mixture of marine and fluviatile shells is observed in it, proving that the sea sometimes gained upon the river, whether at high tides or when the fresh water was less in quantity during the dry season, and sometimes perhaps when the land was slightly depressed in level. All these accidents might occur again and again at the mouth of any river, and give rise to alternations of fluviatile and marine strata, such as are seen at Menchecourt. In the lowest beds of gravel and sand in contact with the chalk, flint hatchets, some perfect, others much rolled, have been found; and in a sandy bed in this position some work men, whom I employed to sink a pit, found four flint knives. Above this sand and gravel occur beds of white and siliceous sand, containing shells of the genera Planorbis, Limnea, Paludina, Valvata, Cyclas, Cyrena, Helix, and others, all now natives of the same part of France, except Cyrena fluminalis (fig. 17), which no longer lives in Europe, but inhabits the Nile, and many parts of Asia, including Cashmere, where it abounds. No species of Cyrena is now met with in a living state in Europe. Mr. Prestwich first observed it fossil at Menchecourt, and it has since been found in two or three contiguous sand-pits, always in the fluvio-marine bed. The following marine shells occur mixed with the fresh- 124 SPECIFIC NAMES OF CYRENA FLUMINALIS. CHAF. VIII. water species above enumerated: Buccinum undatum, Lit- torina littorea, Nassa reticulata, Purpura lapillus, Tellina solidula, Cardium edule, and fragments of some others. Several of these I have myself collected entire, though in a state of great decomposition, lying in the white sand called 6 sable aigre ' by the workmen. They are all littoral species now proper to the contiguous coast of France. Their oc currence in a fossil state associated with freshwater shells at Menchecourt, had been noticed as long ago as 1836 by Fig. 17 a Interior of left valve, from Gray's Thurrock, Essex. b Hinge of same- magnified. c Interior of right valve of a small specimen, from Shacklewell, London. d Outer surface of right valve, from Erith, Kent. Cyrena fluminalis Muller Euphratis Chemnitz consobrina Gaillaud trigonula 8. Wood . gemmelarii Philippi Duchastelii Nyst Corbicula fluminalis Morsch Dates of Specific Names. . 1774 . 1782 . 1823 . 1834 . 1836 . 1838 1853 MM. Ravin and Baillon, before M. Boucher de Perthes com menced the researches which have since made the locality so celebrated.* The numbers since collected preclude all idea of their having been brought inland as eatable shells by the fabricators of the flint hatchets found at the bottom * D'Archiac, Histoire des Progres, &c.,vol. ii. p. 154. CHAP. viii. MAMMALIA FOUND AT MENCHECOURT. 125 of the fluvio-marine sands. From the same beds, and in marls alternating with the sands, remains of the elephant, rhinoceros, and other mammalia, have been exhumed. Above the fluvio-marine strata are those designated No. 2 in the section (fig. 16), which are almost devoid of strati fication, and probably formed of mud or sediment thrown down by the waters of the river when they overflowed the ancient alluvial plain of that day. Some land shells, a few river shells, and bones of mammalia, some of them extinct, occur in No. 2. Its upper surface has been deeply furrowed and cut into by the action of water, at the time when the earthy matter of No. 1 was superimposed. The materials of this uppermost deposit are arranged as if they had been the result of land floods, taking place after the formations 2 and 3 had been raised, or had become exposed to denudation. The fluvio-marine strata and overlying loam of Menche- court recur on the opposite or left bank of the alluvial plain of the Somme, at a distance of two or three miles. They are found at Mautort, among other places, and I ob tained there the flint hatchet figured at p. 115 (fig. 9), of an oval form. It was extracted from gravel, above which were strata containing a mixture of marine and freshwater shells, precisely like those of Menchecourt. In the alluvium of all parts of the valley, both at high and low levels, rolled bones are sometimes met with in the gravel. Some of the flint tools in the gravel of Abbeville have their angles very perfect, others have been much triturated, as if in the bed of the main river or some of its tributaries. The mammalia most frequently cited as having been found in the deposits Nos. 2 and 3 at Menchecourt, are the following : Elephas primigenius. Rhinoceros tichorhinus. Equus fossilis Owen. 126 ENTIRE SKELETON OF RHINOCEROS. CHAP. vin. Bos primigenius. Cervus somonensis Cuvier. C. Tarandus prisons Cuvier. Felis spelcea. Hycena spelcea. The ZTrsus spelceus has also been mentioned by some writers ; but M. Lartet says he has sought in vain for it among the osteological treasures sent from Abbeville to Cuvier at Paris, and in other collections. The same palaeontologist, after a close scrutiny of the bones sent formerly to the Paris Museum from the valley of the Somme, observed that some of them bore the evident marks of an instrument, agreeing well with incisions such as a rude flint-saw would produce. Among other bones mentioned as having been thus artificially cut, are those of a Rhinoceros tichorhinus, and the antlers of Cervus somonensis.* The evidence obtained by naturalists that some of the extinct mammalia of Menchecourt really lived and died in this part of France, at the time of the embedding of the flint tools in fluviatile strata, is most satisfactory ; and not the less so for having been put on record long before any suspicion was entertained that works of art would ever be detected in the same beds. Thus M. Baillon, writing in 1834 to M. Ravin, says, ( They begin to meet with fossil bones at the depth of ten or twelve feet in the Menchecourt sand-pits, but they find a much greater quantity at the depth of eighteen and twenty feet. Some of them were evidently broken before they were embedded, others are rounded, having, without doubt, been rolled by running water. It is at the bottom of the sand-pits that the most entire bones occur. Here they lie without having undergone fracture or friction, and seem to have been articulated together at the time when they were covered up. I found in one place a whole hind limb * Quarterly Journal of the Geological Society, London, vol. xvi. p. 471. CHAP. VITT. FLINT IMPLEMENTS, WHY FOUND IN DEEP DEPOSITS. 127 of a rhinoceros, the bones of which were still in their usual relative position. They must have been joined together by ligaments, and even surrounded by muscles at the time of their interment. The entire skeleton of the same species was lying at a short distance from the spot.' * If we suppose that the greater number of the flint imple ments occurring in the neighbourhood of Abbeville and Amiens were brought by river action into their present position, we can at once explain why so large a proportion of them are found at considerable depths from the surface, for they would naturally be buried in gravel and not in fine sediment, or what may be termed ' inundation mud,' such as No. 2 (fig. 16, p. 122), a deposit from tranquil water, or where the stream had not sufficient force or velocity to sweep along chalk flints, whether wrought or unwrought. Hence we have almost always to pass down through a mass of incum bent loam with land shells, or through fine sand with fresh water mollusks, before we get into the beds of gravel con taining hatchets. Occasionally a weapon used as a projectile may have fallen into quiet water, or may have dropped from a canoe to the bottom of the river, or may have been floated by ice, as are some stones occasionally by the Thames in severe winters, and carried over the meadows bordering its banks ; but such cases are exceptional, though helping to explain how isolated flint tools or pebbles and angular stones are now and then to be seen in the midst of the finest loams. The endless variety in the sections of the alluvium of the valley of the Somme, may be ascribed to the frequent silting up of the main stream and its tributaries during different stages of the excavation of the valley, probably also during changes in the level of the land. As a rule, when a river attacks and undermines one bank, it throws down gravel and sand on the opposite side of its channel, which is growing * Musee Societe Roy. d'Emulation d' Abbeville, 1834, p. 197. 128 RIVERS SHIFTING THEIR CHANNELS. CHAP. VTII. shallower, and is soon destined to be raised so high as to form an addition to the alluvial plain, and to be only occasionally inundated. In this way, after much encroachment on cliff or meadow in one direction, we find at the end of centuries that the width of the channel has not been enlarged, for the new made ground is raised after a time to the full height of the older alluvial tract. Sometimes an island is formed in mid stream, the current flowing for a while on both sides of it, and at length scooping out a deeper channel on one side so as to leave the other to be gradually filled up during freshets and afterwards elevated by inundation mud, or ' brick-earth.' During the levelling up of these old channels, a flood some times cuts into and partially removes portions of the previously stratified matter, causing those repeated signs of furrowing and filling up of cavities, those memorials of doing and undoing, of which the tool-bearing sands and gravels of Abbeville and Amiens afford such reiterated illustrations, and of which a parallel is furnished by the ancient alluvium of the Thames valley, where similar bones of extinct mammalia and shells, including Cyrena fluminalis, are found. Professor Noeggerath, of Bonn, informs me that, about the year 1845, when the bed of the Khine was deepened artifi cially by the blasting and removal of rock in the narrows at Bingerloch, not far from Bingen, several flint hatchets and an extraordinary number of iron weapons of the Roman period were brought up by the dredge from the bed of the great river. The decomposition of the iron had caused much of the gravel to be cemented together into a conglomerate. In such a case we have only to suppose the Rhine to deviate slightly from its course, changing its position, as it has often done in various parts of its plain in historical times, and then tools of the stone and iron periods w6uld be found in gravel at the bottom, with a great thickness of sand and overlying loam deposited above them. CHAP. vin. RIVEES SHIFTING THEIR CHANNELS. 129 Changes in a river plain, such as those above alluded to, give rise frequently to ponds, swamps, and marshes, marking the course of old beds or branches of the river not yet filled up, and in these depressions shells proper both to running and stagnant water may be preserved, and quadrupeds may be mired. The latest and uppermost deposit of the series will be loam or brick-earth, with land and amphibious shells (Helix and Succinea), while below will follow strata contain ing freshwater shells, implying continuous submergence; and lowest of all in most sections will be the coarse gravel accumulated by a current of considerable strength and velocity. When the St. Katharine docks were excavated at London, and similar works executed on the banks of the Mersey, old ships were dug out, as I have elsewhere noticed,* showing how the Thames and Mersey have in modern times been shifting their channels. Recently, an old silted-up bed of the Thames has been discovered by boring at Shoeburyness at the mouth of the river opposite Sheerness, as I learn from Mr. Milne. The old deserted branch is separated from the new or present channel of the Thames, by a tertiary outlier composed of London clay. The depth of the old branch, or the thickness of fluviatile strata with which it has been filled up, is seventy-five feet. The actual channel in the neigh bourhood is now sixty feet deep, but there is probably ten or fifteen feet of stratified sand and gravel at the bottom ; so that, should the river deviate again from its course, its present bed might be the receptacle of a fluvio-marine formation seventy- five feet thick, equal to the former one of Shoeburyness, and more considerable than that of Abbeville. It would consist both of freshwater and marine strata, as the salt water is carried by the tide far up above Sheerness ; but in order that such de- * Principles of Geology. K 130 RELATIVE AGES OF HIGH AND LOW GRAVELS. CHAP. nil. posits should resemble, in geological position, the Menche- court beds, they must be raised ten or fifteen feet above their present level, and be partially eroded. Such erosion they would not fail to suffer during,the process of upheaval, because the Thames would scour out its bed, and not alter its position relatively to the sea, while the land was gradually rising. Before the canal was made at Abbeville, the tide was per ceptible in the Somme for some distance above that city. It would only require, therefore, a slight subsidence to allow the saltwater to reach Menchecourt, as it did in the post- pliocene period. As a stratum containing exclusively land and fresh water shells usually underlies the fluvio-marine sands at Menchecourt, it seems that the river first prevailed there, after which the land subsided ; and then there was an upheaval which raised the country to a greater height than that at which it now stands, after which there was a second sinking, indicated by the position of the peat, as already explained (p. 111). All these changes happened since man first in habited this region. At several places in the environs of Abbeville there are nuviatile deposits at a higher level by fifty feet than those of Menchecourt, resting in like manner on the chalk. One of these occurs in the suburbs of the city at Moulin Quignon, one hundred feet above the Somme and on the same side of the valley as Menchecourt, and containing flint implements of the same antique type and the bones of elephants ; but no marine shells have been found there, nor in any gravel or sand at higher elevations than the Menchecourt marine shells. It has been a matter of discussion among geologists whether the higher or the lower sands and gravels of the Somme valley are the more ancient. As a general rule, when there are alluvial formations of different ages in the same valley, those which occupy a more elevated position above the river plain are the oldest. In Auvergne and Velay, in Central France, where CHAP. VIII. FLINT IMPLEMENTS IN GRAVEL NEAR AMIENS. 131 the bones of fossil quadrupeds occur at all heights above the present rivers from ten to one thousand feet, we observe the terrestrial fauna to depart in character from that now living in proportion as we ascend to higher terraces and platforms. We pass from the lower alluvium, containing the mammoth, tichorhine rhinoceros, and reindeer, to various older groups of fossils, till, on a table-land a thousand feet high (near Le Puy, for example), the abrupt termination of which overlooks the present valley, we discover an old extinct river-bed covered by a current of ancient lava, showing where the lowest level was once situated. In that elevated alluvium the remains of a tertiary mastodon and other quadrupeds of like antiquity are embedded. If the Menchecourt beds had been first formed, and the valley, after being nearly as deep and wide as it is now, had subsided, the sea must have advanced inland, causing small delta-like accumulations at successive heights, wherever the main river and its tributaries met the sea. Such a movement, especially if it were intermittent, and interrupted occasionally by long pauses, would very well account for the accumulation of stratified debris which we encounter at certain points in the valley, especially around Abbeville and Amiens. But we are precluded from adopting this theory by the entire absence of marine shells, and the presence of fresh-water and land species, and mammalian bones, in considerable abundance, in the drift both of higher and lower levels above Abbeville. Had there been a total absence of all organic remains, we might have imagined the former presence of the sea, and the destruction of such remains might have been ascribed to carbonic acid or other decomposing causes; but the post- pliocene and implement-bearing strata can be shown by their fossils to be of fluviatile origin. K 2 132 SECTION OF ALLUVIUM OF ST. ACHEUL. CHAr. vin. Flint Implements in Gravel near Amiens. Gravel of St. Acheul. When we ascend the valley of the Somme, from Abbeville to Amiens, a distance of about twenty-five miles, we observe a repetition of all the same alluvial phenomena which we have seen exhibited at Menchecourt and its neighbourhood, with the single exception of the absence of marine shells and of Cyrena fluminalis. We find lower-level gravel, such as No. 2, fig. 7, p. 106, and higher-level alluvium, such as No. 3, the latter rising to one hundred feet above the plain, which at Amiens is about fifty feet above the level of the river at Abbeville. In both the upper and lower gravels, as Dr. Ei- gollot stated in 1854, flint tools and the bones of extinct animals, together with river shells and land shells of living species, abound. Immediately below Amiens, a great mass of stratified gravel, slightly elevated above the alluvial plain of the Somme, is seen at St. Roch, and half a mile farther down the valley at Montiers. Between these two places, a small tributary stream, called the Celle, joins the Somme. In the gravel at Montiers, Mr. Prestwich and I found some flint knives, one of them flat on one side, but the other carefully worked, and exhibi ting many fractures, clearly produced by blows skilfully applied. Some of these knives were taken from so low a level as to satisfy us that this great bed of gravel at Montiers, as well as that of the contiguous quarries of St. Roch, which seems 'to be a continuation of the same deposit, may be referred to the human period. Dr. Eigollot had already mentioned flint hatchets as obtained by him from St. Koch, but as none have been found there of late years, his statement was thought to require confirmation. The discovery, therefore, of these flint knives in gravel of the same age was interesting, CHAP. VIII. FOSSIL MOLAR TEETH OF ELEPHANTS. Fig. 18 133 Elcpkas primigenius. Penultimate molar, lower jaw, right side, one-third of natural size, Post-pliocene. Coexisted with man. Fig, 19 Elcphas antiquus Falconer. Penultimate molar, lower jaw, right side, size one-third of nature, Post-pliocene and Newer pliocene. Coexisted with man. Fig. 20 * Elcphas meridionalis Nesti. Penultimate molar, lower jaw, right side, size one-third of original, Newer plio cene, Saint Prest, near Chartres, and Norwich Crag. Not yet proved to have coexisted with man. * For fig. 20, I am indebted to M.Lartet^ and fig. 18 will be found in his paper in Bulletin de laSociete Geo- logique de France, Mars 1859. Fig. 19 is from Fauna Sivalensis, Falconer and Cautley. 134 SECTION OF GRAVEL AT ST. ACHEUL. CHAP. vin. especially as many tusks of a hippopotamus have been ob tained from the gravel of St. Roch some of these recently by Mr. Prestwich ; while M. Gamier of Amiens has procured a fine elephant's molar from the same pits, which Dr. Falconer refers to Mephas antiquus, see fig. 19, p. 133. Hence I infer that both these animals co-existed with man. The alluvial formations of Montiers are very instructive in another point of view. If, leaving the lower gravel of that place, which is topped with loam or brick-earth (of which the upper portion is about thirty feet above the level of the Somme), we ascend the chalky slope to the height of about eighty feet, another deposit of gravel and sand, with fluviatile shells in a perfect condition, occurs, indicating most clearly an ancient river-bed, the waters of which^ran habitually at that higher level before the valley had been scooped out to its present depth. This superior deposit is on the same side of the Somme, and about as high, as the lowest part of the celebrated formation of St. Acheul, two or three miles distant, to which I shall now allude. The terrace of St. Acheul may be described as a gently sloping ledge of chalk, covered with gravel, topped as usual with loam or fine sediment, the surface of the loam being 100 feet above the Somme, and about 150 above the sea. Many stone coffins of the Gallo-Roman period have been dug out of the upper portion of this alluvial mass. The trenches made for burying them sometimes penetrate to the depth of eight or nine feet from the surface, entering the upper part of No. 3 of the sections Nos. 21 and 21 A. They prove that when the Romans were in Gaul they found this terrace in the same condition as it is now, or rather as it was before the removal of so much gravel, sand, clay, and loam, for repairing roads, and for making bricks and pottery. In the annexed section, which I observed during my last visit in 1860, it will be seen that a fragment of an elephant's tooth CHAP. VIIT. SECTION OF GRAVEL AT ST. ACHETJL. 135 is noticed as having been dug out of unstratified sandy loam at the point a, eleven feet from the surface. This was found at the time of my visit ; and at a lower point, at b, eighteen Fig. 21 Section of a gravel pit containing flint implements at St. Acheul, near Amiens, observed in July 1860. 1 Vegetable soil and made ground, two to three feet thick. 2 Brown loam with some angular flints, in parts passing into ochreous gravel, filling up indentations on the surface of No. 3, three feet thick. 3 White siliceous sand with layers of chalky marl, and included fragments of chalk, for the most part unstratified, nine feet. 4 Flint-gravel, and whitish chalky sand, flints subangular, average size of fragments, three inches diameter, but with some large unbroken chalk flints intermixed, cross stratification in parts. Bones of mammalia, grinder of elephant at b, and flint implement at c, ten to fourteen feet. 5 Chalk with flints. a Part of elephant's molar, eleven feet from the surface. b Entire molar of E. primigenius, seventeen feet from surface. c Position of flint hatchet, eighteen feet from surface. feet from the surface, a large nearly entire and unrolled mo lar of the same species was obtained, which is now in my pos session. It has been pronounced by Dr. Falconer to belong to Elephas primigenius. 136 SANDSTONE BLOCKS IN GRAVEL OF SOMME. CHAP. vm. A stone hatchet of an oval form, like that represented at fig. 9, p. 115, was discovered at the same time, about one foot lower down, at c, in densely compressed gravel. The surface of the fundamental chalk is uneven in this pit, and slopes towards the .valley-plain of the Somme. In a horizontal distance of twenty feet, I found a difference in vertical height of seven feet. In the chalky sand, sometimes occurring in interstices between the separate fragments of flint, constituting the coarse gravel No. 4, entire as well as broken fresh-water shells are often met with. To some it may appear enigmatical how such fragile objects could have escaped annihilation in a river-bed, when flint tools and much gravel were shoved along the bottom ; but I have seen the dredging instrument employed in the Thames, above and below London Bridge, to deepen the river, and worked by steam power, scoop up gravel and sand from the bottom, and then pour the contents pell-mell into the boat, and still many specimens of Limnea, Planorbis, Paludina, Cyclas, and other shells might be taken out uninjured from the gravel. It will be observed that the gravel No. 4 is obliquely stra tified, and that its surface had undergone denudation before the white sandy loam, No. 3, was superimposed. The materials of the gravel at d must have been cemented or frozen together into a somewhat coherent mass to allow the projecting ridge, dy to stand up five feet above the general surface, the sides being in some places perpendicular. In No. 3 we probably behold an example of a passage from river-silt to inundation mud, or loess. In some parts of it, land shells occur. It has been ascertained by MM. Buteux, Ravin, and other observers conversant with the geology of this part of France, that in none of the alluvial deposits, ancient or modern, are there any fragments of rocks foreign to the basin of the Somme no erratics which could only be explained by sup- CHAP. vm. FOSSIL MAMMALIA IN DRIFT OF THE SOMME. 137 posing them to have been brought by ice, during a general submergence of the country, from some other hydrographical basin. But in some of the pits at St. Acheul there are seen in the beds No. 4, fig. 21, not only well-rounded tertiary pebbles, but great blocks of hard sandstone, of the kind called in the south of England ( greyweathers,' some of which are three or four feet and upwards in diameter. They are usually angular, and when spherical owe their shape generally to an original concretionary structure, and not to trituration in a river's bed. These large fragments of stone abound both in the higher and lower level gravels round Amiens and at the higher level at Abbeville. They have also been traced far up the valley above Amiens, wherever patches of the old alluvium occur. They have all been derived from the tertiary strata which once covered the chalk. Their dimensions are such that it is impossible to imagine a river like the present Somme, flowing through a flat country, with a gentle fall towards the sea, to have carried them for miles down its channel, unless ice cooperated as a transporting power. Their angularity also favours the supposition of their having been floated by ice, or rendered so buoyant by it as to have escaped much of the wear and tear which blocks propelled along the bottom of a river channel would otherwise suffer. We must remember that the present mildness of the winters in Picardy and the north-west of Europe generally is exceptional in the northern hemisphere, and that large fragments of granite, sandstone, and limestone are now carried annually by ice down the Canadian rivers in latitudes farther south than Paris. * Another sign of ice agency observed by me in many pits at St. Acheul, and of which Mr. Prestwich has given a good * Principles of Geology, 9th ed. p. 220. 138 CONTORTED STRATA AT ST. ACHEUL. CHAP. VIII. illustration in one of his published sections, deserves notice. It consists in flexures and contortions of the strata of sand, Fig. 21 A Contorted fluviatile strata at St. Acheul (Prestwich, Phil. Trans. 1861, p. 299). 1 Surface soil. 2 Brown loam as in fig. 21, p. 135, thickness, six feet. 3 "White sand with bent and folded layers of marl thickness, six feet. 4 Gravel, as in fig. 21, p. 135 with bones of mammalia and flint im plements. A Graves filled with made ground and human bones. b and c Seams of laminated marl often bent round upon themselves. d Beds of gravel with sharp curves. marl, and gravel (as seen at b, c and d, fig. 21 A), which they have evidently undergone since their original deposition, and from which both the underlying chalk and part of the overlying beds of sand No. 3 are usually exempt. In my former writings I have attributed this kind of derangement to two causes ; first, the pressure of ice running aground on yielding banks of mud and sand ; and, secondly, the melting of masses of ice and snow of unequal thickness, on which horizontal layers of mud, sand, and other fine and coarse materials had accumulated. The late Mr. Trimmer first pointed out in what manner the unequal failure of sup port caused by the liquefaction of underlying or intercalated snow and ice might give rise to such complicated foldings.* * See Chapter XII. CHAP. VIII. ICE-ACTION IN THE BEDS OF RIVEKS. 139 When 6 ice-jams' occur on the St. Lawrence and other Canadian rivers (lat. 46 N.), the sheets of ice, which become packed or forced under or over one another, assume in most cases a highly inclined and sometimes even a vertical position. They are often observed to be coated on one side with mud, sand, or gravel frozen on to them, derived from shallows in the river on which they rested when congelation first reached the bottom. As often as portions of these packs melt near the margin of the river, the layers of mud, sand, and gravel, which result from their liquefaction, cannot fail to assume a very abnormal arrangement, very perplexing to a geologist who should undertake to interpret them without having the ice-clue in his mind. Mr. Prestwich has suggested that ground-ice may have had its influence in modifying the ancient alluvium of the Somme.* It is certain that ice in this form plays an active part every winter in giving motion to stones and gravel in the beds of rivers in European Russia and Siberia. It appears that when in those countries the streams are reduced nearly to tne freezing point, congelation begins frequently at the bottom ; the reason being, according to Arago, that the current is slowest there, and the gravel and large stones, having paxted with much of their heat by radiation, acquire a temperature below the average of the main body of the river. It is, therefore, when the water is clear, and the sky free from clouds, that ground ice forms most readily, and oftener on pebbly than on muddy bottoms. Fragments of such ice, rising occasionally to the surface, bring up with them gravel, and even large stones. Without dwelling longer on the various ways in which ice may affect the forms of stratification in drift, so as to cause bendings and foldings in which the underlying or over- * Prestwich, Memoir read to Royal Society, April 1862. 140 PROBABLE CAUSES OF ACCUMULATION CHAP. vm. lying strata do not participate, a subject to which I shall have occasion again to allude in the sequel, I will state in this place that such contortions, whether explicable or not, are very characteristic of glacial formations. They have also no necessary connection with the transportation of large blocks of stone, and they therefore afford, as Mr. Prestwich remarks, independent proof of ice-action in the post-pliocene gravel of the Somme. Let us, then, suppose that, at the time when flint hatchets were embedded in great numbers in the ancient gravel which now forms the terrace of St. Acheul, the main river and its tributaries were annually frozen over for several months in winter. In that case, the primitive people may, as Mr. Prestwich hints, have resembled in their mode of life those American Indians who now inhabit the country between Hudson's Bay and the Polar Sea. The habits of those Indians have been well described by Hearne, who spent some years among them. As often as deer and other game become scarce on the land, they betake themselves to fishing in the rivers ; and for this purpose, and also to obtain water for drinking, they are in the constant practice of cutting round holes in the ice, a foot or more in diameter, through which they throw baited hooks or nets. Often they pitch their tent on the ice, and then cut such holes through it, using ice- chisels of metal when they can get copper or iron, but when not, employing tools of flint or hornstone. The great accumulation of gravel at St. Acheul has taken place in part of the valley where the tributary streams, the Noye and the Arve, now join the Somme. These tribu taries,, as well as the main river, must have been running at the height first of a hundred feet, and afterwards at various lower levels above the present valley-plain, in those earlier times when the flint tools of the antique type were buried in successive river beds. I have said at various levels, be- CHAP. vni. OF FLINT IMPLEMENTS IN ANCIENT GRAVEL. 141 cause there are, here and there, patches of drift at heights intermediate between the higher and lower gravel, and also some deposits, showing that the river once flowed at elevations above as well as below the level of the platform of St. Aoheul. As yet, however, no patch of gravel skirting the valley at heights exceeding one hundred feet above the Somme have yielded flint tools or other signs of the former sojourn of man in this region. Possibly, in the earlier geographical condition of this country, the confluence of tributaries with the Somme afforded inducements to a hunting and fishing tribe to settle there, and some of the same natural advantages may have caused the first inhabitants of Amiens and Abbeville to fix on the same sites for their dwellings. If the early hunting and fishing tribes frequented the same spots for hundreds or thousands of years in succession, the number of the stone implements lost in the bed of the river need not surprise us. Ice-chisels, flint hatchets, and spear -heads may have slipped accidentally through holes kept constantly open, and the recovery of a lost treasure once sunk in the bed of the ice bound stream, inevitably swept away with gravel on the breaking up of the ice in the spring, would be hopeless. During a long winter, in a country affording abundance of flint, the manufacture of tools would be continually in pro gress ; and, if so, thousands of chips and flakes would be pur posely thrown into the ice-hole, besides a great number of implements having flaws, or rejected as too unskilfully made to be worth preserving. As to the fossil fauna of the drift, considered in relation to the climate, when I took a collection which I had made of all the more common species of land and freshwater shells from the Amiens and Abbeville drift, to my friend M. Deshayes at Paris, he declared them to be, without exception, the same as those now living in the basin of the Seine. This fact may seem at first 142 CLIMATE OF THE LOWER GRAVELS. CHAP. vm. sight to imply that the climate had not altered since the flint tools were fabricated ; but it appears that all these species of mollusks now range as far north as Norway and Finland, and may therefore have flourished in the valley of the Somme when the river was frozen over annually in winter. In regard to the accompanying mammalia, some of them, like the mammoth and tichorhine rhinoceros, may have been able to endure the rigours of a northern winter as well as the rein-deer, which we find fossil in the same gravel, it is a more difficult point to determine whether the climate of the lower gravels (those of Menchecourt, for example) was more genial than that of the higher ones. Mr. Prestwich inclines to this opinion. None of those contortions of the strata above described (p. 138) have as yet been observed in the lower drift. It contains large blocks of tertiary sandstone and grit, which may have required the aid of ice to convey them to their present sites; but as such blocks already abounded in the older and higher alluvium, they may simply be monuments of its destruction, having been let down suc cessively to lower and lower levels without making much seaward progress. The Cyrena fluminalis of Menchecourt and the hippo potamus of St. Eoch seem to be in favour of a less severe temperature in winter ; but so many of the species of mammalia, as well as of the land and fresh-water shells, are common to both formations, and our information respecting the entire fauna is still so imperfect, that it would be prema ture to pretend to settle this question in the present state of our knowledge. We must be content with the conclusion (and it is one of no small interest), that when man first inhabited this part of Europe, at the time that the St. Acheul drift was formed, the climate as well as the physical geography of the country differed considerably from the state of things now established there. CHAP. vm. CAUSES OF EXTINCTION OF MAMMALIA. 143 Among the elephant remains from St. Acheul, in M Grarnier's collection, Dr. Falconer recognised a molar of the Elephas antiquus, fig. 19, the same species which has been already mentioned as having been found in the lower-level gravels of St. Koch. This species, therefore, endured while important changes took place in the geographical condition of the valley of the Somme. Assuming the lower-level gravel to be the newer, it follows that the Elephas antiquus and the hippopotamus of St. Eoch continued to flourish long after the introduction of the mammoth, a well characterized tooth of which, as I before stated, was found at St. Acheul at the time of my visit in 1860. As flint hatchets and knives have been discovered in the alluvial deposits both at high and low levels, we may safely affirm that man was as old an inhabitant of this region as were any of the fossil quadrupeds above enumerated, a conclusion which is independent of any difference of opinion as to the relative age of the higher and lower gravels. The disappearance of many large pachyderms and beasts of prey from Europe has often been attributed to the inter vention of man, and no doubt he played his part in hastening the era of their extinction ; but there is good reason for sus pecting that other causes cooperated to the same end. No naturalist would for a moment suppose that the extermination of the Cyrena fluminalis throughout the whole of Europe a species which coexisted with our race in the valley of the Somme, and which was very abundant in the waters of the Thames at the time when the elephant, rhinoceros, and hippopotamus flourished on its banks was accelerated by human agency. The same modification in climate and other conditions of existence which affected this aquatic mollusk, may have mainly contributed to the gradual dying out of many of the large mammalia. We have already seen that the peat of the valley of the 144 ABSENCE OF HUMAN BONES EXPLAINED. CHAP. vm. Somme is a formation which, in all likelihood, took thousands of years for its growth. But no change of a marked character has occurred in the mammalian fauna since it began to ac cumulate. The contrast of the fauna of the ancient alluvium, whether at high or low levels, with the fauna of the oldest peat is almost as great as its contrast with the existing fauna, the memorials of man being common to the whole series ; hence we may infer that the interval of time which separated the era of the large extinct mammalia from that of the earliest peat, was of far longer duration than that of the entire growth of the peat. Yet we by no means need the evidence of the ancient fossil fauna to establish the antiquity of man in this part of France. The mere volume of the drift at various heights would alone suffice to demonstrate a vast lapse of time during which such heaps of shingle, derived both from the Eocene and the cretaceous rocks, were thrown down in a succession of river-channels. We observe thousands of rounded and half-rounded flints, and a vast number of angular ones, with rounded pieces of white chalk of various sizes, testifying to a prodigious amount of mechanical action, accompanying the repeated widening and deepening of the valley, before it became the receptacle of peat ; and the po sition of many of the flint tools leaves no doubt on the mind of the geologist that their fabrication preceded all this reiterated denudation. On the Absence of Human Bones in the Alluvium of the Somme. It is naturally a matter of no small surprise that, after we have collected many hundred flint implements (including knives, many thousands), not a single human bone has yet been met with in the alluvial sand and gravel of the Somme. This dearth of the mortal remains of our species holds true CHAP. VIIT. ABSENCE OF HUMAN BONES EXPLAINED. 145 equally, as yet, in all other parts of Europe where the tool- bearing drift of the post-pliocene period has been investigated in valley deposits. Yet in these same formations there is no want of bones of mammalia belonging to extinct and living species. In the course of the last quarter of a century, thousands of them have been submitted to the examination of skilful osteologists, and they have been unable to detect among them one fragment of a human skeleton, not even a tooth. Yet Cuvier pointed out long ago, that the bones of man found buried in ancient battle-fields were not more de cayed than those of horses interred in the same graves. We have seen that in the Liege caverns, the skulls, jaws, and teeth, with other bones of the human race, were preserved in the same condition as those of the cave-bear, tiger, and mammoth. That ere long, now that curiosity has been so much excited on this subject, some human remains will be detected in the older alluvium of European valleys, I confidently expect. In the mean time, the absence of all vestige of the bones which belonged to that population by which so many weapons were designed and executed, affords a most striking and instructive lesson in regard to the value of negative evidence, when adduced in proof of the non-existence of certain classes of terrestrial animals at given periods of the past. It is a new and emphatic illustration of the extreme imperfection of the geological record, of which even they who are constantly working in the field cannot easily form a just conception. We must not forget that Dr. Schmerling, after finding extinct mammalia and flint tools in forty-two Belgian caverns, was only rewarded by the discovery of human bones in three or four of those rich repositories of osseous remains. In like manner, it was not till the year 1855 that the first skull of the musk buffalo (Bubalus moschatus) was detected in the fossiliferous gravel of the Thames, and not till 1860, as will be seen in the next chapter, that the same quadruped L 146 ABSENCE OF HUMAN BONES EXPLAINED. CHAP. vm. was proved to have co-existed in France with the mammoth. The same theory which will explain the comparative rarity of such species would no doubt account for the still greater scarcity of human bones, as well as for our general ignorance of the post-pliocene terrestrial fauna, with the exception of that part of it which is revealed to us by cavern researches. In valley drift we meet commonly with the bones of quad rupeds which graze on plains bordering rivers. Carnivorous beasts, attracted to the same ground in search of their prey, sometimes leave their remains in the same deposits, but more rarely. The whole assemblage of fossil quadrupeds at present obtained from the alluvium of Picardy is obviously a mere fraction of the entire fauna which flourished contemporane ously with the primitive people by whom the flint hatchets were made. Instead of its being part of the plan of nature to store up enduring records of a large number of the individual plants and animals which have lived on the surface, it seems to be her chief care to provide the means of disencumbering the habit able areas lying above and below the waters of those myriads of solid skeletons of animals, and those massive trunks of trees, which would otherwise soon choke up every river, and fill every valley. To prevent this inconvenience she employs the heat and moisture of the sun and atmosphere, the dissolv ing power of carbonic and other acids, the grinding teeth and gastric juices of quadrupeds, birds, reptiles, and fish, and the agency of many of the invertebrata. We are all familiar with the efficacy of these and other causes on the land ; and as to the bottoms of seas, we have only to read the published reports of Mr. MacAndrew, the late Edward Forbes, and other experi enced dredgers, who, while they failed utterly in drawing up from the deep a single human bone, declared that they scarcely ever met with a work of art even after counting tens of thousands of shells and zoophytes, collected on a coast line CHAP. vin. HUMAN BONES NOT FOUND IN LAKE OF HAARLEM. 147 of several hundred miles in extent, where they often ap proached within less than half a mile of a land peopled by millions of human beings. Lake of Haarlem. It is not many years since the Government of Holland re solved to lay dry that great sheet of water formerly called the Lake of Haarlem, extending over 45,000 square acres. They succeeded, in 1853, in turning it into dry land, by means of powerful pumps constantly worked by steam, which raised the water and discharged it into a canal running for twenty or thirty miles round the newly-gained land. This land was depressed thirteen feet beneath the mean level of the ocean. I travelled, in 1859, over part of the bed of this old lake, and found it already converted into arable land, and peopled by an agricultural population of 5000 souls. Mr. Staring, who had been for some years employed by the Dutch Grovern- ment in constructing a geological map of Holland, was my companion and guide. He informed me that he and his associates had searched in vain for human bones in the de posits which had constituted for three centuries the bed of the great lake. There had been many a shipwreck, and many a naval fight in those waters, and hundreds of Dutch and Spanish soldiers and sailors had met there with a watery grave. The popula tion which lived on the borders of this ancient sheet of water numbered between thirty and forty thousand souls. In dig ging the great canal, a fine section had been laid open, about thirty miles long, of the deposits which formed the ancient bottom of the lake. Trenches, also, innumerable, several feet deep, had been freshly dug on all the farms, and their united length must have amounted to thousands of miles. In some of the sandy soil recently thrown out of the trenches, I observed L 2 148 ABSENCE OF HUMAN BONES EXPLAINED. CHAP. vnr. specimens of fresh-water and brackish -water shells, such as Unio and Dreissena, of living species ; and in clay brought up from below the sand, shells of Tellina, Lutraria, and Cardium, all of species now inhabiting the adjoining sea. One or two wrecked Spanish vessels, and arms of the same period, have rewarded the antiquaries who had been watching the draining operations in the hope of a richer harvest, and who were not a little disappointed at the result. In a peaty tract on the margin of one part of the lake a few coins were dug up ; but if history had been silent, and if there had been a controversy whether man was already a denizen of this planet at the time when the area of the Haarlem lake was under water, the archaeologist, in order to answer this ques tion, must have appealed, as in the case of the valley of the Somme, not to fossil bones, but to works of art embedded in the superficial strata. Mr. Staring, in his valuable memoir on the ( Geological Map of Holland,' has attributed the general scarcity of human bones in Dutch peat, notwithstanding the many works of art preserved in it, to the power of the humic and sulphuric acids to dissolve bones, the peat in question being plenti fully impregnated with such acids. His theory may be cor rect, but it is not applicable to the gravel of the Valley of the Somme, in which the bones of fossil mammalia are fre quent, nor to the uppermost fresh-water strata forming the bottom of a large part of the Haarlem Lake, in which it is not pretended that such acids occur. The primitive inhabitants of the Valley of the Somme may have been too wary and sagacious to be often surprised and drowned by floods, which swept away many an incautious elephant or rhinoceros, horse and ox. But even if those rude hunters had cherished a superstitious veneration for the Somme, and had regarded it as a sacred river (as the modern Hindoos revere the Granges), and had been in the habit of CHAP. vni. SCARCITY OF HUMAN BONES. 149 committing the bodies of their dead or dying to its waters even had such funeral rites prevailed, it by no means fpllows that the bones of many individuals would have been preserved to our time. A corpse cast into the stream first sinks, and must then be almost immediately overspread with sediment of a certain weight, or it will rise again when distended with gases, and float perhaps to the sea before it sinks again. It may then be attacked by fish of marine species, some of which are capable of digesting bones. If, before being carried into the sea and devoured, it is enveloped with fluviatile mud and sand, the next flood, if it lie in mid channel, may tear it out again, scatter all the bones, roll some of them into pebbles, and leave others exposed to destroying agencies ; and this may be repeated annually, till all vestiges of the skeleton may disappear. On the other hand, a bone washed through a rent into a subterranean cavity, even though a rarer contingency, may have a greater chance of escaping destruction, especially if there be stalactite dropping from the roof of the cave or walls of a rent, and if the cave be not constantly traversed by too strong a current of engulfed water. 150 FLINT IMPLEMENTS IN BASIN OF THE SEINE. CHAP. IX. CHAPTER IX. WORKS OF AET IN POST-PLIOCENE ALLUVIUM OF FRANCE AND ENGLAND. FLINT IMPLEMENTS IN ANCIENT ALLUVIUM OF THE BASIN OF THE SEINE BONES OF MAN AND OF EXTINCT MAMMALIA IN THE CAVE OF ARCY EXTINCT MAMMALIA IN THE VALLEY OF THE OISE FLINT IMPLEMENT IN GEAVEL OF SAME VALLEY WORKS OF ART IN POST- PLIOCENE DRIFT IN VALLEY OF THE THAMES MUSK BUFFALO MEETING OF NORTHERN AND SOUTHERN FAUNA MIGRATIONS OF QUADRUPEDS MAMMALS OF AMOOR LAND CHRONOLOGICAL RELA TION OF THE OLDER ALLUVIUM OF THE THAMES TO THE GLACIAL DRIFT FLINT IMPLEMENTS OF POST-PLIOCENE PERIOD IN SURREY, MIDDLESEX, KENT, BEDFORDSHIRE, AND SUFFOLK. Flint Implements in Post-pliocene Alluvium in the Basin of the Seine. IN the ancient alluvium of the valleys of the Seine and its principal tributaries, the same assemblage of fossil animals, which has been alluded to in the last chapter as character ising the gravel of Picardy, has long been known ; but it was not till the year 1860, and when diligent search had been expressly made for them, that flint implements of the Amiens type were discovered in this part of France. In the neighbourhood of Paris, deposits of drift occur answering both to those of the higher and lower levels of the basin of the Somme before described.* In both are found, mingled with the wreck of the tertiary and cretaceous rocks of the vicinity, a large quantity of granitic sand, and pebbles, and occasionally large blocks of granite, from a few inches * Prestwich, Proceedings of Boy. Soc. 1862. CHAP. IX. BASIN OF THE SEINE. 151 to a foot or more in diameter. These blocks are peculiarly abundant in the lower drift commonly called the ' diluvium The granitic materials are traceable to a chain of hills called the Morvan, where the head waters of the Yonne take their rise, 150 miles to the SSE. of Paris. It was in this lowest gravel that M. H. T. Grosse, of Geneva, found, in April 1860, in the suburbs of Paris, at La Motte Piquet, on the left bank of the Seine, one or two well- formed flint implements of the Amiens type, accompanied by a great number of ruder tools or attempts at tools. I visited the spot in 1861 with M. Hebert, and saw the stratum from which the worked flints had been extracted, twenty feet below the surface, and near the bottom of the 'grey dilu vium,' a bed of gravel from which I have myself, in and near Paris, frequently collected the bones of the elephant, horse, and other mammalia. More recently, M. Lartet has discovered at Clichy, in the environs of Paris, in the same lower gravel, a well-shaped flint implement of the Amiens type, together with remains both of Elephas primigenius and E. antiquus. No tools have yet been met with in any of the gravel occurring at the higher levels of the valley of the Seine ; but no importance can be attached to this negative fact, as so little search has yet been made for them. Mr. Prestwich has observed contortions indicative of ice- action, of the same kind as those near Amiens (see p. 138), in the higher level drift at Charonne, near Paris ; but as yet no similar derangement has been seen in the lower gravels a fact, so far as it goes, in unison with the phenomena observed in Picardy. In the cavern of Arcy-sur- Yonne a series of deposits have lately been investigated by the Marquis de Vibraye, who discovered human bones in the lowest of them, mixed with remains of quadrupeds of extinct and recent species. This 152 BONES IN THE CAVE OF ARCY. CHAP. ix. cavern occurs in Jurassic limestone, at a slight elevation above the Cure, a small tributary of the Yonne, which last joins the Seine near Fontainebleau, about forty miles south of Paris. The lowest formation in the cavern resembles the ( diluvium gris ' of Paris, being composed of granitic ma terials, and like it derived chiefly from the waste of the crystalline rocks of the Morvan. In it have been found the two branches of a human lower jaw with teeth well-pre served, and the bones of the Elephas prim.igenius, Rhinoceros tichorhinus, Ursus spelceus, Hycena spelcea, and Cervus Tarandus, all specifically determined by M. Lartet. I have been shown this collection of fossils by M. de Vibraye, and remarked that the human and other remains were in the same condition and of the same colour. Above the grey gravel is a bed of red alluvium, made up of fragments of Jura limestone, in a red argillaceous matrix, in which were embedded several flint knives, with bones of the reindeer and horse, but no extinct mammalia. Over this, in a higher bed of alluvium, were several polished hatchets of the more modern type called f celts,' and above all loam or cave-mud, in which were Grallo-Eoman antiquities.* The French geologists have made as yet too little progress in identifying the age of the successive deposits of ancient alluvium of various parts of the basin of the Seine, to enable us to speculate with confidence as to the coincidence in date of the granitic gravel with human bones of the Grrotte d'Arcy and the stone- hatchets buried in ' grey diluvium ' of La Motte Piquet, before mentioned ; but as the associated extinct mam malia are of the same species in both localities, I feel strongly inclined to believe that the stone hatchets found by M. Grosse at Paris, and the human bones discovered by M. de Vibraye, may be referable to the same period. * Bulletin de la Societe Greologique de France, 1860. CHAP. IX. EXTINCT MAMMALIA IN VALLEY OF THE OISE. 153 Valley of the Oise. A flint hatchet, of the old Abbeville and Amiens type, was found lately by M. Peigne Delacourt at Precy near Criel, on the Oise, in gravel, resembling, in its geological position, the lower-level gravels of Montiers near Arniens, already de scribed. I visited these extensive gravel-pits in 1861, in company with Mr. Prestwich; but we remained there too short a time to entitle us to expect to find a flint implement, even if they had been as abundant as at St. Acheul. In 1859, I examined, in a higher part of the same valley of the Oise, near Chauny and Noyon, some fine railway cuttings, which passed continuously through alluvium of the post-pliocene period for half a mile. All this alluvium was evidently of fluviatile origin, for, in the interstices between the pebbles, the Ancylus fluviatilis and other freshwater shells were abundant. My companion, the Abbe E. Lam bert, had collected from the gravel a great many fossil bones, among which M. Lartet has recognised both Elephas primi- genius and E. antiquus, besides a species of hippopotamus (H. major ?), also the rein-deer, horse, a.nd the musk buffalo (Bubalus moschatus). The latter seems never to have been seen before in the old alluvium of France.* Over the gravel above mentioned, near Chauny, are seen dense masses of loam like the loess of the Rhine, containing shells of the genera Helix and Succinea. We may suppose that the gravel containing the flint hatchet at Precy is of the same age as that of Chauny, with which it is continuous, and that both of them are coeval with the tool-bearing beds of Amiens, for the basins of the Oise and the Somme are only separated by a narrow water-shed, and the same fossil quadrupeds occur in both. * Lartet, Annales des Sciences Naturelles Zoologiques, torn. xv. p. 224. 154 POST-PLIOCENE ALLUYIUM OF ENGLAND. CHAP. IX. The alluvium of the Seine and its tributaries, like that of the Somme, contains no fragments of rocks brought from any other hydrographical basin; yet the shape of the land, or fall- of the river, or the climate, or all these conditions, must have been very different when the grey alluvium in which the flint tools occur at Paris was formed. The great size of some of the blocks of granite, and the distance which they have travelled, imply a power in the river which it no longer possesses. We can scarcely doubt that river-ice once played a much more active part than now in the transportation of such blocks, one of which may be seen in the Museum of the Ecole des Mines at Paris, three or four feet in diameter. Post-pliocene Alluvium of England, containing Works of Art. In the ancient alluvium of the basin of the Thames, at moderate heights above the main river, and its tributaries, we find fossil bones of the same species of extinct and living mammalia, accompanied by recent species, of land and fresh water shells, as we have shown to be characteristic of the basins of the Somme and the Seine. We can scarcely therefore doubt that these quadrupeds, during some part of the post- pliocene period, ranged freely from the continent of Europe to England, at a time when there was an uninterrupted communication by land between the two countries. The reader will not therefore be surprised to learn that flint implements of the same antique type as those of the valley of the Somme have been detected in British alluvium. The most marked feature of this alluvium in the Thames valley is that great bed of ochreous gravel, composed chiefly of broken and slightly worn chalk flints, on which a great part of London is built. It extends from above Maidenhead through the metropolis to the sea, a distance from west to east CHAP. ix. POST-PLIOCENE ALLUVIUM OF ENGLAND. 155 of fifty miles, having a width varying from two to nine miles. Its thickness ranges commonly from five to fifteen feet.* In- terstratified with this gravel, in many places, are beds of sand, loam, and clay, the whole containing occasionally remains of the mammoth and other extinct quadrupeds. Fine sections have been exposed to view, at different periods, at Brentford and Kew Bridge, others in London itself, and below it at Ilford and Erith in Kent, on the right bank, and at Gray's Thurrock in Essex, on the left bank. The united thickness of the beds of sand, gravel, and loam amounts sometimes to forty or even sixty feet. They are for the most part elevated above, but in some cases they descend below, the present level of the overflowed plain of the Thames. If the reader will refer to the section of the post-pliocene sands and gravels of Menchecourt, near Abbeville, given at p. 118, he will perfectly understand the relations of the ancient Thames alluvium to the modern channel and plain of the river, and their relation, on the other hand, to the boundary formations of older date, whether tertiary or cretaceous. So far as they are known, the fossil mollusca and mammalia of the two districts also agree very closely, the Cyrenaflumi- nalis being common to both, and being the only extra-Euro pean shell, this and all the species of testacea being recent. Of this agreement with the living fauna there is a fine illustra tion in Essex ; for the determination of which we are indebted to the late Mr. John Brown, F.Gr.S., who collected at Cop- ford, in Essex, from a deposit containing bones of the mam moth, a large bear (probably Ursus spelceus), a beaver, stag, and aurochs, no less than sixty-nine species of land and fresh-water shells. Forty-eight of these were terrestrial, and two of them, Helix incarnata and H. ruderata, no longer in habit the British Isles, but are still living on the continent, * Prestwich, Geological Quarterly Journal, vol. xii. p. 131. 156 MEETING OF NORTHERN AND SOUTHERN FAUNA. CFAP. IX. the first in high northern latitudes.* The Cyrena flumi- nalis and the Unio littoralis, to which last I shall presently allude, were not among the number. I long ago suggested the hypothesis, that in the basin of the Thames there are indications of a meeting in the post- pliocene period of a northern and southern fauna. To the northern group may have belonged the mammoth (Elepkas primigenius) and the Rhinoceros tichorhinus, both of which Pallas found in Siberia, preserved with their flesh in the ice. With these are occasionally associated the rein-deer. In 1855 the skull of the musk-ox (Bubalus moschatus) was also found in the ochreous gravel of Maidenhead, by the Eev. C. Kingsley and Mr. Lubbock; the identification of this fossil with the living species being made by Professor Owen. A second fossil skull of the same arctic animal was afterwards found by Mr. Lubbock near Bromley, in the valley of a small tribu tary of the Thames; and two others were dug up at Bath Easton from the gravel of the valley of the Avon. Professor Owen has truly said, that, c as this quadruped has a constitu tion fitting it at present to inhabit the high northern regions of America, we can hardly doubt that its former companions, the warmly-clad mammoth and the two-horned woolly rhino ceros (R. tichorhinus), were in like manner capable of sup porting life in a cold climate.' f I have alluded at p. 144 to the recent discovery of this same buffalo near Chauny, in the valley of the Oise, in France ; and in 1856 I found a skull of it preserved in the museum at Berlin, which Professor Quenstedt, the curator, had correctly named so long ago as 1836, when the fossil was dug out of drift, in the hill called the Kreuzberg, in the southern * Quarterly Geological Journal, he merely meant extinct in England, vol. viii. p. 190, 1852. f Geological Quarterly Journal, Mr. Brown calls them extinct species, vol. xii. p. 124. which may mislead some readers, but CHAP. ix. MIGKATIONS OF QUADKUPEDS. 157 suburbs of that city. By an account published at the time, we find that the mammalia which accompanied the musk buffalo were the mammoth and tichorhine rhinoceros, with the horse and ox ; * but I can find no record of the occurrence of a hippopotamus, nor of Elephas antiquus or Rhinoceros leptorhinus, in the drift of the north of Germany, bordering the Baltic. On the other hand, in another locality in the same drift of North Grermany, Dr. Hensel, of Berlin, detected, near Qued- linburg, the Norwegian Lemming (Myodes Lemmus), and another species of the same family called by Pallas Myodes tor- quatus (by Hensel, Misothermus torquatus) a still more arctic quadruped, found by Parry in latitude 82, and which never strays farther south than the northern borders of the woody region. Professor Beyrich also informs me that the remains of the Rhinoceros tichorhinus were obtained at the same place.f As an example of what may possibly have constituted a more southern fauna in the valley of the Thames, I may allude to the fossil remains found in the fluviatile alluvium of Grray's Thurrock, in Essex, situated on the left bank of the river, twenty-one miles below London. The strata of brick- earth, loam, and gravel exposed to view in artificial excava tions in that spot, are precisely such as would be formed by the silting up of an old river channel. Among the mammalia are Elephas antiquus, Rhinoceros leptorhinus (_R. megarhinus Christol), Hippopotamus major, species of horse, bear, ox, stag, &c., and, among the accompanying shells, Cyrenaflumi- nalis, which is extremely abundant, instead of being scarce, as at Abbeville. It is associated with Unio littoralis, fig. 22, also in great numbers, and with both valves united. This conspicuous fresh-water mussel is no longer an inhabitant of * Leonhard and Bronn's Jahrbuch, gischen Gesellschaft, vol. vii. 1855, 1836, p. 215. p. 548, &c. f Zeitschrift der Deutschen Greolo- 158 MAMMALS OF AMOORLAND. CHAP. ix. the British Isles, but still lives in the Seine, and is still more abundant in the Loire. Another fresh-water univalve (Palu- dina marginata Michaud), not British, but common in the Fig. 22 Unio littoralis. Gray's Thurrock, Essex; extinct in British Isles, living in France. south of France, likewise occurs, and a peculiar variety of Gyclas amnica, which by some naturalists has been regarded as a distinct species. With these, moreover, is found a peculiar variety of Valvata piscinalis. If we consult Dr. Von Schrenck's account of the living mammalia of Amoorland, lying between lat. 45 and 55 North, we learn that, in that part of North -Eastern Asia recently annexed to the Russian empire, no less than thirty-four out of fifty-eight living quadrupeds are identical with European species, while some of those which do not extend their range to Europe are arctic, others tropical forms. The Bengal tiger ranges northwards occasionally to lat. 52 North, where he chiefly subsists on the flesh of the rein-deer, and the same tiger abounds in lat. 48, to which the small tail-less hare or pika, a polar resident, sometimes wanders southwards.* We may readily conceive that the countries now drained by the Thames, the Somme, and the Seine, were, in the post-pliocene * Mammalia of Amoorland, Natural History Keview, vol. i. p. 12, 1861. CHAP. IX. CHRONOLOGY OF FLUYIATILE DEPOSITS. 159 period, on the borders of two distinct zoological provinces, one lying to the north, the other to the south, in which case many species belonging to each fauna endowed with migra tory habits, like the living musk-buffalo or the Bengal tiger, may have been ready to take advantage of any, even the slightest, change in their favour to invade the neighbouring province, whether in the summer or winter months, or permanently for a series of years, or centuries. The Elephas antiquus and its associated Rhinoceros leptorhinus may have preceded the mammoth and tichorhine rhinoceros in the valley of the Thames, or both may have alternately prevailed in the same area in the post-pliocene period. In attempting to settle the chronology of fluviatile deposits, it is almost equally difficult to avail ourselves of the evidence of organic remains and of the superposition of the strata, for we may find two old river-beds on the same level in juxta-position, one of them perhaps many thousands of years posterior in date to the other. I have seen an example of this at Ilford, where the Thames, or a tributary stream, has at some former period cut through sands containing Cyrena fluminalis, and again filled up the channel with argillaceous matter, evidently derived from the waste of the tertiary London clay. Such shiftings of the site of the main channel of the river, the frequent removal of gravel and sand previously deposited, and the throwing down of new alluvium, the flooding of tributaries, the rising and sinking of the land, fluctuations in the cold and heat of the climate all these changes seem to have given rise to that complexity in the fluviatile deposits of the Thames, which accounts for the small progress we have hitherto made in determining their order of succession, and that of the imbedded groups of quadrupeds. It may happen, as at Brentford and Ilford, that sand-pits in two adjoining fields may each contain distinct species of elephant and rhinoceros ; and they may occur at the same 160 CHRONOLOGY OF FLTJVIATILE DEPOSITS. CHAP. ix. depth from the surface, and yet be referable each to two sub divisions of the post-pliocene epoch, separated by thousands of years. The relation of the glacial period to alluvial deposits, such as that of Gray's Thurrock, where the Cyrena fluminalis, Unio littoralisy and the hippopotamus seem rather to imply a warmer climate, has been a matter of long and animated discussion. Patches of the northern drift, at elevations of about two hundred feet above the Thames, occur in the neighbourhood of London, as at Muswell Hill, near Highgate. In this drift, blocks of granite, syenite, greenstone, coal-measure sandstone with its fossils, and other paleozoic rocks, and the wreck of chalk and oolite, occur confusedly mixed together. The same glacial formation is also found capping some of the Essex hills farther to the east, and extending some way down their southern slopes towards the valley of the Thames. Although no fragments washed out of these older and upland drifts have been found in the gravel of the Thames containing elephants' bones, it is fair to presume that the glacial formation is the older of the two, for reasons given before at p. 130, and that it originated, as we shall see in a future chapter, when the greater part of England was submerged beneath the sea. In short, we must suppose that the basin of the Thames and all its fluviatile deposits are post-glacial, in the modified sense of that term ; i. e. that they were subsequent to the marine drift of the central and northern counties, and to the period of its emergence above the level of the sea. Having offered these general remarks on the alluvium of the Thames, I may now say something of the implements hitherto discovered in it. In the British Museum there is a flint weapon of the spear-headed form, such as is represented in fig. 8, p. 114, which we are told was found with an elephant's tooth at Black Mary's, near Gray's Inn Lane, London. In a letter dated 1715, printed in Herne's edition of 'Leland's CHAP. IX. FLINT IMPLEMENTS IN MIDDLESEX AND SURREY. 161 Collectanea,' vol. i. p. 73, it is stated to have been found in the presence of Mr. Conyers, with the skeleton of an elephant.* So many bones of the elephant, rhinoceros, and hippopotamus have been found in the gravel on which London stands, that there is no reason to doubt the statement as handed down to us. Fossil remains of all these three genera have been dug up on the site of Waterloo Place, St. James's Square, Charing Cross, the London Docks, Limehouse, Bethnal Green, and other places within the memory of persons now living. In the gravel and sand of Shacklewell, in the northern suburbs of London, I have myself collected specimens of the Cyrena fluminalis in great numbers, see fig. 17 c, p. 124, with the bones of deer and other mammalia. In the alluvium also of the Wey, near Gruildford, in a place called Pease Marsh, a wedge-shaped flint implement, resembling one brought from St. Acheul, by Mr. Prestwich, and compared by some antiquaries to a sling-stone, was ob tained in 1836 by Mr. Whitburn, four feet deep in sand and gravel, in which the teeth and tusks of elephants had been found. The Wey flows through the gorge of the North Downs at Gruildford to join the Thames. Mr. Austen has shown that this drift is so ancient that one part of it had been disturbed and tilted before another part was thrown down.f Among other places where flint tools of the antique type have been met with in the course of the last three years, I may mention one of an oval form found by Mr. Evans in the valley of the Darent, and another which the same observer found lying on the shore at Swalecliff, near Whitstable, in Kent, where Mr. Prestwich had previously described a fresh water deposit, resting on the London clay, and consisting chiefly of gravel, in which an elephant's tooth and the bones of a bear were embedded. The, flint implement was deeply * Evans, Archseologia, 1860. f Quarterly Geological Journal, 1851, vol. vii. p. 278. M 162 FLINT IMPLEMENTS IN KENT. CHAP. TX. discoloured and of a peculiar bright light brown colour, similar to that of the old fluviatile gravel in the cliff. Another flint implement was found in 1860, by Mr. T. Leech, at the foot of the cliff between Herne Bay and the Eeculvers, and on further search five other specimens of the spear-head pattern so common at Amiens. Messrs. Prestwich and Evans have since found three other similar tools on the beach, at the base of the same wasting cliff, which consists of sandy Eocene strata. Upon these, at the top of the cliff, is a pebbly deposit of fresh-water origin, about fifty feet above the sea-level, from which the flint weapons must have been derived. Such old alluvial deposits now capping the cliffs of Kent seem to have been the river-beds of tributaries of the Thames before the sea encroached to its present position and widened its estuary. On following up one of these fresh-water deposits westward of the Eeculvers, Mr. Prestwich found in it, at Chislet, near Grove Ferry, the Cyrena fluminalis among other shells. The changes which have taken place in the physical geo graphy of this part of England during, or since, the post- pliocene period, have consisted partly of such encroachments of the sea on the coast as are now going on, and partly of a general subsidence of the land. Among the signs of the latter movement may be mentioned a fresh-water formation at Faversham, below the level of the sea. The gravel there contains exclusively land and fluviatile shells, of the same species as those of other localities of the post-pliocene allu vium before mentioned, and must have been formed when the river was at a higher level and when it extended farther east. At that era it was probably a tributary of the Ehine, as represented by Mr. Trimmer in his ideal restoration of the geography of the olden time.* For England was then united to the continent, and what is now the German Ocean was * Quarterly Geological Journal, vol. ix. pi. 13, No. 4. CHAP. IX. FLINT IMPLEMENTS IN BEDFORDSHIRE. 163 land. It is well known that in many places, especially near the coast of Holland, elephants' tusks and other bones are often dredged up from the bed of that shallow sea, and the reader will see in the map given in Chap. XIII. how vast would be the conversion of sea into land by an upheaval of 600 feet. Vertical movements of much less than half that amount would account for the annexation of England to the continent, and the extension of the Thames and its valley far to the north east, and the flowing of rivers from the easternmost parts of Kent and Essex into the Thames, instead of emptying them selves into its estuary. More than a dozen flint weapons of the Amiens type have already been found in the basin of the Thames; but the geological position of no one of them has as yet been ascer tained with the same accuracy as that of many of the tools dug up in the valley of the Somme, or some other British examples which will presently be mentioned. Flint Implements of the Valley of the Ouse, near Bedford. The ancient fluviatile gravel of the valley of the Ouse, around Bedford, has been noted for the last thirty years for yielding to collectors a rich harvest of the bones of extinct mammalia ; those of the elephant, rhinoceros, and hippopo tamus being amongst the number. Mr. James Wyatt, F.Gr.S., having returned in 1860 from France, where, in the gravel- pits of St. Acheul, near Amiens, he had marked the position of the flint tools, resolved to watch carefully the excavation of the gravel-pits at Biddenham, two miles WNW. of Bedford, in the hope of finding there similar works of art. With this view he paid almost daily visits for months in succession to those pits, and was at last rewarded by the discovery of two well-formed implements, one of the spear-head and the other of the oval shape, perfect counterparts of the two prevailing 164 SECTION ACROSS THE VALLEY OF THE OUSE. CHAP. ix. French types figured at pp. 114, 115. Both specimens were thrown out by the workmen on the same day from the lowest bed of stratified gravel and sand, thirteen feet thick, containing bones of the elephant, deer, and ox, and many fresh-water shells. The two implements occurred at the depth of thirteen feet from the surface of the soil, and rested immediately on solid beds of oolitic limestone, as represented in the accom panying section. Fig. 23 Section across the Valley of the Ouse, two miles WNW. of Bedford. 1 Oolitic strata. 2 Boulder clay, or marine northern drift, rising to about ninety feet above the Ouse. 3 Ancient gravel, with elephant bones, freshwater shells, and flint im plements. 4 Modern alluvium of the Ouse. a Biddenham gravel pits, at the bottom of which flint tools were found. I examined these pits, in 1861, in company with Messrs. Prestwich, Evans, and Wyatt, and we collected ten species of shells from the stratified drift No. 3, or the beds overlying the lowest gravel from which the flint implements had been exhumed. They were all of common fluviatile and land species now living in the same part of England. Since our visit, Mr. Wyatt has added to them Paludina marginata Michaud (Hydrobia of some authors, see p. 225 infra), species of the South of France no longer inhabiting the British Isles. The same geologist has also found, since we were at Bidden- , ham, several other flint tools of corresponding type, both there and at other localities in the Valley of the Ouse, near Bedford. The boulder clay, No. 2, extends for miles in all directions, and was evidently once continuous from b to c, before the CHAP. IX. FLINT TOOLS NEAK BEDFOKD. 165 valley was scooped out. It is a portion of the great marine glacial drift of the midland counties of England, and contains blocks, some of large size, not only of the oolite of the neigh bourhood, but of chalk and other rocks transported from still greater distances, such as syenite, basalt, quartz, and new red sandstone. These erratic blocks of foreign origin are often polished and striated, having undergone what is called glaciation, of which more will be said by and by. Blocks of the same mineral character, embedded at Biddenham in the gravel No. 3, have lost all signs of this striation by the friction to which they were subjected in the old river-bed. The great width of the valley of the Ouse, which is some times two miles, has not been expressed in the diagram. It may have been shaped out by the joint action of the river and the tides when this part of England was emerging from the waters of the glacial sea, the boulder clay being first cut through, and then an equal thickness of underlying oolite. After this denudation, which may have accompanied the emergence of the land, the country was inhabited by the primitive people who fashioned the flint tools. The old river, aided perhaps by the continued upheaval of the whole country, or by oscillations in its level, went on widening and deepening the valley, often shifting its channel, until at length a broad area was covered by a succession of the earliest and latest deposits, which may have cor responded in age to the higher and lower gravels of the valley of the Somme, already described, p. 130. Mr. Prestwich has hinted that perhaps the drift of Biddenham, which is thirty feet above the present level of the Ouse, and contains bones of Elephas primigenius, and the shells above alluded to, may be a higher level alluvium ; and the gravel on which, the town of Bedford is built, which is at an inferior level relatively to the Ouse, may be a lower deposit and con sequently newer. But we have scarcely as yet sufficient data 166 ANCIENT FLINT IMPLEMENTS CHAP. ix. to enable us to determine the relative age of these strata. In the Bedford gravel, last alluded to, some remains of Hippopo tamus major and Elephas antiquus have been discovered, and an assemblage of land and freshwater shells of recent species, but not precisely the same as those of Biddenham. One step at least we gain by the Bedford sections, which those of Amiens and Abbeville had not enabled us to make. They teach us that the fabricators of the antique tools, and the extinct mammalia coeval with them, were all post-glacial, or, in other words, posterior to the grand submergence of Central England beneath the waters of the glacial sea. Flint Implements in a Freshwater Deposit at Hoxne in Suffolk. So early as the first year of the present century, a re markable paper was communicated to the Society of An tiquaries by Mr. John Frere, in which he gave a clear description of the discovery at Hoxne, near Diss, in Suffolk, of flint tools of the type since found at Amiens, adding at the same time good geological reasons for presuming that their an tiquity was very great, or, as he expressed it, beyond that of the present world, meaning the actual state of the physical geography of that region. ( The flints,' he said, ' were evidently weapons of war, fabricated and used by a people who had not the use of metals. They lay in great numbers at the depth of about twelve feet in a stratified soil which was dug into for the purpose of raising clay for bricks. Under a foot and a half of vegetable earth was clay seven and a half feet thick, and beneath this one foot of sand with shells, and under , this two feet of gravel, in which the shaped flints were found generally at the rate of five or six in a square yard. In the sandy beds with shells were found the jaw bone and teeth of an enormous unknown animal. The manner in which the CHAP. ix. AT HOXNE, NEAR DISS, SUFFOLK. 167 flint weapons lay would lead to the persuasion that it was a place of their manufacture, and not of their accidental de posit. Their numbers were so great that the man who carried on the brick- work told me that before he was aware of their being objects of curiosity, he had emptied baskets full of them into the ruts of the adjoining road.' Mr. Frere then goes on to explain that the strata in which the flints occur are disposed horizontally, and do not lie at the foot of any higher ground, so that portions of them must have been removed when the adjoining valley was hollowed out. If the author had not mistaken the freshwater shells associated with the tools for marine species, there would have been nothing to correct in his account of the geology of the dis trict, for he distinctly perceived that the strata in which the implements were embedded had, since that time, undergone very extensive denudation.* Specimens of the flint spear heads, sent to London by Mr. Frere, are still preserved in the British Museum, and others are in the collection of the Society of Antiquaries. Mr. Prestwich's attention was called by Mr. Evans to those weapons, as well as to Mr. Frere's memoir after his return from Amiens in 1859, and he lost no time in visiting Hoxne, a village five miles eastward of Diss. It is not a little re markable that he should have found, after a lapse of sixty years, that the extraction of clay was still going on in the same brick-pit. Only a few months before his arrival, two flint instruments had been dug out of the clay, one from a depth of seven and the other of ten feet from the surface. Others have since been disinterred from undisturbed beds of gravel in the same pit. Mr. Amyot, of Diss, has also obtained from the underlying freshwater strata the astragalus of an elephant, and bones of the deer and horse ; but although many of the old implements have recently been discovered * Frere, Archseologia for 1800, vol. xiii. p. 206. 168 FLINT IMPLEMENTS IN SUFFOLK. CHAP. ix. in situ in regular strata and preserved by Sir Edward Kerrison, no bones of extinct mammalia seem as yet to have been actually seen in the same stratum with one of the tools. By reference to the annexed section, the geologist will see that the basin-shaped hollow a, b, c, has been filled up gradually with the fresh- water strata 3, 4, 5, after the same cavity a, 6, c, had been previously excavated out of the more ancient boulder clay, No. 6. The relative position of these formations will be better understood when I have described in the Twelfth Fig. 24 farm Sea, Level 9 Chalk Section showing the position of the flint weapons at Hoxne, near Diss, Suffolk. See Prestwich, Philosophical Transactions, PI. 11. 1860. 1 Gravel of Gold Brook, a tributary of the "Waveny. 2 Higher-level gravel overlying the freshwater deposit. 3 and 4. Sand and gravel, with freshwater shells, and flint imple ments, and bones of mammalia. 5 Peaty and clayey beds, with same fossils. 6 Boulder clay or glacial drift. 7 Sand and gravel below boulder clay. 8 Chalk with flints. Chapter the structure of Norfolk and Suffolk as laid open in the sea-cliffs at Mundesley, about thirty miles distant from Hoxne, in a North North-east direction. I examined the deposits at Hoxne in 1860, when I had the advantage of being accompanied by the Rev. J. GKmn, and the Rev. S. W. King. In the loamy beds 3 and 4, fig. 24, we observed the common river shell Valvata piscinalis in great numbers. With it, but much more rare, were Limnea palustris, Planorbis albus, P. spirorbis, Succinea putris, Bithynia tentaculata, Cyclas cornea; and Mr. Prestwich mentions Cyclas amnica and fragments of a Unio, besides CHAP. ix. FLINT IMPLEMENTS IN SUFFOLK. 169 several land shells. In the black peaty mass No. 5, fragments of wood of the oak, yew, and fir have been recognised. The flint weapons which I have seen from Hoxne are so much more perfect, and have their cutting edge so much sharper than those from the Valley of the Somme, that they seem neither to have been used by man, nor to have been rolled in the bed of a river. The opinion of Mr. Frere, therefore, that there may have been a manufactory of weapons on the spot, appears probable. Flint Implements at Icklingham in Suffolk. In another part of Suffolk, at Icklingham, in the Valley of the Lark, below Bury St. Edmund's, there is a bed of gravel, in which two flints of a lance-head form have been found at the depth of four feet from the surface. I have visited the spot, which has been correctly described by Mr. Prestwich.* The section of the Bedford tool-bearing alluvium, given at p. 155, may serve to illustrate that of Icklingham, if we sub stitute chalk for oolite, and the river Lark for the Ouse. In both cases, the present bed of the river is about thirty feet below the level of the old gravel, and the chalk hill, which bounds the Valley of the Lark on the right side, is capped like the oolite of Biddenham by boulder clay, which rises to the height of one hundred feet above the Lark. About twelve years ago, a large erratic block, above four feet in diameter, was dug out of the boulder clay at Icklingham, which I found to consist of a hard siliceous schist, apparently a Silurian rock, which must have come from a remote region. The tool-bearing gravel here, as in the case to which it has been compared near Bedford, is proved to be newer than the glacial drift, by containing pebbles of basalt and other rocks derived from that formation. * Quarterly Geological Journal, 1861, vol. xvii. p. 364. 170 FOSSIL WORKS OF ART IN SOMERSETSHIRE. CHAP. x. CHAPTEE X. CAVERN DEPOSITS, AND PLACE OF SEPULTURE OF THE POST- PLIOCENE PERIOD. FLINT IMPLEMENTS IN CAVE CONTAINING HYJENA AND OTHEE EXTINCT MAMMALIA IN SOMERSETSHIRE CAVES OF THE GOWER PENINSULA IN SOUTH WALES RHINOCEROS HEMITO3CHUS OSSIFEROUS CAVES NEAR PALERMO SICILY ONCE PART OF AFRICA RISE OF BED OF THE MEDITERRANEAN TO THE HEIGHT OF THREE HUNDRED FEET IN THE HUMAN PERIOD IN SARDINIA BURIAL PLACE OF POST-PLIOCENE DATE OF AURIGNAC IN THE SOUTH OF FRANCE RHINOCEROS TICHORHINUS EATEN BY MAN M. LARTET ON EXTINCT MAMMALIA AND WORKS OF ART FOUND IN THE AURIGNAC CAVE RELATIVE ANTIQUITY OF THE SAME, CONSIDERED. Works of Art associated with extinct Mammalia in a Cavern in Somersetshire. THE only British cave from which implements resembling those of Amiens have been obtained, since the attention of geologists has been awakened to the importance of minutely observing the position of such relics relatively to the asso ciated fossil mammalia, is that recently opened near Wells in Somersetshire. It occurs near the cave of Wokey Hole, from the mouth of which the river Axe issues on the southern flanks of the Mendips. No one had suspected that on the left side of the ravine, through which the river flows after escaping from its subterranean channel, there were other caves and fissures concealed beneath the green sward of the steep sloping bank. About ten years ago, a canal was made, several hundred yards in length, for the purpose of leading the waters of the Axe to a paper-mill, now occupying the middle of the ravine. In carrying out this work, about twelve feet of the left bank was cut away, and a cavernous CHAP. x. FOSSIL WOKKS OF ART IN SOMERSETSHIRE. 171 fissure, choked up to the roof with ossiferous loam, was then, for the first time, exposed to view. This great cavity, origi nally nine feet high and thirty-six wide, traversed the dolomitic conglomerate ; and fragments of that rock, some angular and others water-worn, were scattered through the red mud of the cave, in which fossil remains were abundant. For an account of them and the position they occupied we are indebted to Mr. Dawkins, F.Gr.S., who, in company with Mr. Williamson, explored the cavern in 1859, and obtained from it the bones of the Hycena spelcea in such numbers as to lead him to conclude that the cavern had for a long time been a hyaena's den. Among the accompanying animals found fossil in the same bone-earth, were observed Elephas primigenius, Rhinoceros tichorhinus, Ursus spelceus, Bos primigenius, Megaceros hybernicus, Cervus Tarandus (and other species of Cervus), Ursus spelceus., Felis spelcea, Canis Lupus, Canis Vulpes, and teeth and bones of the genus Equus in great numbers. Intermixed with the above fossil bones were some arrow heads, made of bone, and many chipped flints, and chipped pieces of chert, a white or bleached flint weapon of the spear-head Amiens type, which was taken out of the undis turbed matrix by Mr. Williamson himself, together with a hyaena's tooth, showing that man had either been contempo raneous with or had preceded the extinct fauna. After penetrating thirty-four feet from the entrance, Mr. Dawkins found the cave bifurcating into two branches, one of which was vertical. By this rent, perhaps, some part of the contents of the cave may have been introduced.* When I examined the spot in 1860, after I had been shown some remains of the hyaena collected there, I felt convinced that a complete revolution must have taken place in the * W. B. Dawkins, F.G.S., Geological Society's Proceedings, January 1862. 172 OSSIFEROUS CAYES IN SOUTH WALES. CHAP. x. topography of the district since the time of the extinct quadrupeds. I was not aware at the time that flint tools had been met with in the same bone-deposit. Caves of Gower in Glamorganshire, South Wales. The ossiferous caves of the peninsula of Grower in Gla morganshire have been diligently explored of late years by Dr. Falconer and Lieutenant-Colonel E. K. Wood, the latter of whom has discovered and thoroughly investigated the con tents of many which were previously unknown. Among their contents have been found the remains of almost every quadruped elsewhere found fossil in British caves : in some places the JElephas primigenius, accompanied by its usual companion the Rhinoceros tichorhinus, in others Elephas antiquus associated with Rhinoceros hemitoschus Falconer ; the extinct animals being often embedded, as in the Belgian caves, in the same matrix with species now living in Europe, such as the common badger (Melee taxus), the common wolf, and the fox. In a cavernous fissure called the Raven's cliff, teeth of several individuals of Hippopotamus major, both young and old, were found ; and this in a district where there is now scarce a rill of running water, much less a river in which such quadrupeds could swim. In one of the caves, called Spritsail Tor, both of the elephants above named were observed, with a great many other quadrupeds of recent and extinct species. From one fissure, called Bosco's Den, no less than one thou sand antlers of the rein-deer, chiefly of the variety called Cervus Guettardi, were extracted by the persevering ex ertions of Colonel Wood, who estimated that several hundred more still remained in the bone-earth of the same rent. They were mostly shed horns, and of young animals ; and CHAP. x. RHINOCEROS HEMITCECHUS COEXISTENT WITH MAN. 173 had been washed into the rent with other bones, and with angular fragments of limestone, and all enveloped in the same ochreous rnud. Among the other bones, which were not numerous, were those of the cave-bear, wolf, fox, ox, stag, and field-mouse. But the discovery of most importance, as bearing on the subject of the present work, is the occurrence in a newly- discovered cave, called Long Hole, by Colonel Wood, in 1861, of the remains of two species of rhinoceros, R. tichorhinus and R. hemitoechus Falconer, in an undisturbed deposit, in the lower part of which were some well-shaped flint knives, evidently of human workmanship. It is clear from their po sition that man was coeval with these two species. We have elsewhere independent proofs of his coexistence with every other species of the cave-fauna of Glamorganshire ; but this is the first well-authenticated example of the occurrence of R. hemitoechus in connection with human implements. In the fossil fauna of the valley of the Thames, Rhinoceros leptorhinus was mentioned as occurring at Gray's Thurrock with Elephas antiquus. Dr. Falconer, in a memoir which he is now preparing for the press on the European pliocene and post-pliocene species of the genus Rhinoceros, has shown that, under the above name of R. leptorhinus, three distinct species have been confounded by Cuvier, Owen, and other palaeontologists : 1. R. Megarhinus Christol, being the original and typical R. leptorhinus of Cuvier, founded on Cortesi's Monte Zago cranium, and the only pliocene, or post-pliocene European species, that had not a nasal septum. Gray's Thurrock, &c. 2. R. hemitoechus Falconer, in which the ossification of the septum dividing the nostrils is incomplete in the middle, besides other cranial and dental characters distinguishing it from R. tichorhinus, accompanies Elephas antiquus in most of the oldest British bone-caves, such as Kirkdale, Cefn, 174 OSSIFEEOUS CAVES IN SICILY. CHAP. x. Durdham Down, Minchin Hole, and other Grower caverns also found at Clacton, in Essex, and in Northamptonshire. 3. R. etruscus Falconer, a comparatively slight and slender form, also with an incomplete bony septum,* occurs deep in the Val d'Arno deposits, and in the 'Forest bed,' and superimposed blue clays, with lignite, of the Norfolk coast, but nowhere as yet found in the ossiferous caves in Britain. Dr. Falconer announced in 1859 his opinion that the filling up of the Grower caves in South Wales took place after the deposition of the marine boulder clay,f an opinion in harmony with what we have since learnt from the section of the gravels near Bedford, given above at p. 155, where a fauna corresponding to that of the Welsh caves characterises the ancient alluvium, and is shown to be clearly post-glacial, in the sense of being posterior in date to the submergence of the midland counties beneath the waters of the glacial sea. The Grower caves in general have their floors strewed over with sand, containing marine shells, all of living species ; and there are raised beaches on the adjoining coast, and other geological signs of great alteration in the relative level of land and sea, since that country was inhabited by the extinct mammalia, some of which, as we have seen, were certainly coeval with man. Ossiferous Caves in North of Sicily. Greologists have long been familiar with the fact that on the northern coast of Sicily, between Termini on the east, and Trapani on the west, there are many caves containing the bones of extinct animals. These caves are situated in rocks of hippurite limestone, a member of the cretaceous series, and some of them may be seen on both sides of the Bay of * See Falconer, Quarterly Geolo- f Geological Quarterly Journal, gical Journal, vol. xv. p. 602. vol. xvi. p. 491, 1860. CHAP. x. OSSIFEROUS GATES IN SICILY. 175 Palermo. If in the neighbourhood of that city we proceed from the sea inland, ascending a sloping terrace, composed of the marine Newer Pliocene strata, we reach about a mile from the shore, and at the height of about one hundred and eighty feet above it. a precipice of limestone, at the base of which appear the entrances of several caves. In that of San Giro, on the east side of the bay, we find at the bottom sand with marine shells, forty species of which have been examined, and found almost all to agree specifically with mollusca now inhabiting the Mediterranean. Higher in position, and resting on the sand, is a breccia, composed of pieces of limestone, quartz, and schist in a matrix of brown marl, through which land shells are dispersed, together with bones of. two species of hippopotamus, as determined by Dr. Falconer. Certain bones of the skeleton were counted in such numbers as to prove that they must have belonged to several hundred individuals. With these were associated the remains of Elephas antiquus, and bones of the genera Bos, Cervus, Sus, Ursus, Canis, and a large Felis. Some of these bones have been rolled as if partially subjected to the action of water, and may have been introduced by streams through rents in the hippurite limestone ; but there is now no running water in the neighbourhood, no river such as the hippopotamus might frequent, not even a small brook, so that the physical geography of the district must have been alto gether changed since the time when such remains were swept into fissures, or into the channels of engulfed rivers. No proofs seem yet to have been found of the existence of man at the period when the hippopotamus and Elephas an- tiquus flourished at San Giro. But there is another cave called the -Grotto di Maccagnone, which much resembles it in geological position, on the opposite or west side of the Bay of Palermo, near Carini. In the bottom of this cave a bone deposit like that of San Giro occurs, and above it other 176 OSSIFEROUS CAVES IN SICILY. CHAP. x. materials reaching to the roof, and evidently washed in from above, through crevices in the limestone. In this upper and newer breccia Dr. Falconer discovered flint knives, bone splinters, bits of charcoal, burnt clay, and other objects in dicating human intervention, mingled with entire land shells, teeth of horses, coprolites of hyaenas, and other bones, the whole agglutinated to one another and to the roof by the infiltration of water holding lime in solution. The perfect condition of the large fragile helices (Helix vermiculatci) afforded satisfactory evidence, says Dr. Falconer, that the various articles were carried into the cave by the tranquil agency of water, and not by any tumultuous action. At a subsequent period other geographical changes took place, so that the cave, after it had been filled, was washed out again, or emptied of its contents with the exception of those patches of breccia which, being cemented together by stalactite, still adhere to the roof.* Baron Anca, following up these investigations, explored, in 1859, another cave at Mondello, west of Palermo, and north of Mount Grallo, where he discovered molars of the living African elephant, and afterwards additional specimens of the same species in the neighbouring grotto of Olivella, In re ference to this elephant, Dr. Falconer has reminded us that the distance between the nearest part of Sicily and the coast of Africa, between Marsala and Cape Bon, is not more than eighty miles, and Admiral Smyth, in his Memoir on the Mediterranean, states (p. 499) that there is a subaqueous plateau, named by him Adventure Bank, uniting Sicily to Africa by a succession of ridges which are not more than from forty to fifty fathoms under water.f Sicily therefore might be re-united to Africa by movements of upheaval not * Note, Quarterly Geological Journal, dent of Geological Society, Anni- yol. xvi. p. 105, 1860. versary Address, February 1861, t Note, Cited by Mr. Horner, Presi- p. 42. CHAP. x. UPRAISED BED OF THE SARDINIAN SEA. 177 greater than those which are already known to have taken place within the human period on the borders of the Mediter ranean, of which I shall now proceed to cite a well-authen ticated example, observed in Sardinia. Rise of the Bed of the Sea to the Height of 300 Feet, in the Human Period, in Sardinia. Count Albert de la Marmora, in his description of the geo logy of Sardinia, * has shown that on the southern coast of that island, at Cagliari and in the neighbourhood, an ancient bed of the sea, containing marine shells of living species, and numerous fragments of antique pottery, has been elevated to the height of from seventy to ninety-eight metres above the present level of the Mediterranean. Oysters and other shells, of which a careful list has been published, including the common mussel (Mytilus edulis), many of them having both valves united, occur, embedded in a breccia in which fragments of limestone abound. The mussels are often in such numbers as to impart, when they have decomposed, a violet colour to the marine stratum. Besides pieces of coarse pottery, a flattened ball of baked earthenware, with a hole through its axis, was found in the midst of the marine shells. It is supposed to have been used for weighting a fish ing net. Of this and of one of the fragments of ancient pottery Count de la Marmora has given figures. The upraised bed of the sea probably belongs in this in stance to the post-pliocene period, for in a bone breccia, filling fissures in the rocks around Cagliari, the remains of extinct mammalia have been detected ; among which is a new genus of carnivorous quadruped, named Cynotherium by M. Studiati, and figured by Count de la Marmora in his Atlas (pi. vii.), also an extinct species of Lagomys, determined by Cuvier in 1825 * Partie Geologique, torn. i. pp. 382, 387. N J78 CLIMATE AND HABITS OP THE HIPPOPOTAMUS. CHAP. x. Embedded in the same bone breccia, and enveloped with red earth like the mammalian remains, were detected shells of the Mytilus edulis before mentioned, implying that the marine formation containing shells and pottery had been already upheaved and exposed to denudation before the remains of quadrupeds were washed into these rents and included in the red earth. In the vegetable soil covering the upraised marine stratum, with the older works of art, frag ments of Eoman pottery occur. If we assume the average rate of upheaval to have been, as before hinted, p. 58, two and a half feet in a century, 300 feet would give an antiquity of 12,000 years to the Cagliari pot tery, even if we simply confine our estimate to the upheaval above the sea-level, without allowing for the original depth of water in which the mollusca lived. Even then our calculation would merely embrace the period during which the upward movement was going on ; and we can form at present no con- jecture as to the probable era of its commencement or termi nation. I learn from Capt. Spratt, E.N., that the island of Crete or Candia, about 135 miles in length, has been raised at its western extremity about twenty-five feet ; so that ancient ports are now high and dry above the sea, while at its eastern end it has sunk so much that the ruins of old towns are seen under water. Revolutions like these in the physical geography of the countries bordering the Mediterranean, may well help us to understand the phenomena of the Palermo caves, and the presence in Sicily of African species of mammalia. Climate and Habits of the Hippopotamus. As I have alluded more than once in this chapter (pp. 172, 175) to the occurrence of the remains of the hippopotamus in places where there are now no rivers, not even a rill of water, and as other bones of the same genus have been met CHAP. x. CLIMATE AND HABITS OF THE HIPPOPOTAMUS. 179 with in the lower level gravels of the Somme (p. 134), where large blocks of sandstone seem to imply that ice once played a part in their transportation, it may be well to consider, before proceeding farther, what geographical and climatal conditions are indicated by the presence of these fossil pachyderms. It is now very generally conceded that the mammoth and tichorhine rhinoceros were fitted to inhabit northern regions, and it is therefore natural to begin by asking whether the extinct hippopotamus may not in like manner have flourished in a cold climate. In answer to this enquiry, it has been remarked, that the living hippopotami, anatomically speaking so closely allied to the extinct species, are so aquatic and fluviatile in their habits, as to make it difficult to conceive that their congeners could have thriven all the year round in regions where, during winter, the rivers were frozen over for months. Moreover, I have been unable to learn that, in any instance, bones of the hippopotamus have been found in the drift of northern Grermany associated with the remains of the mammoth, tichorhine rhinoceros, musk-buffalo, rein deer, lemming, and other arctic quadrupeds before alluded to (p. 157); yet, though not proved to have ever made a part of such a fauna, the presence of the fossil hippopotamus north of the fiftieth parallel of latitude naturally tempts us to speculate on the migratory powers and instincts of some of the extinct species of the genus. They may have resembled, in this respect, the living musk-buffalo, herds of which pass for hundreds of miles over the ice to the rich pastures of Melville Island, and then return again to southern latitudes before the ice breaks up. I am indebted to Dr. Falconer for having called my attention to the account given by an experienced zoologist, Dr. Andrew Smith,* of the migratory habits of the living hippopotamus of Southern Africa (H. amphibius, Linn.). * Illustrations of the Zoology of South Africa : art. ' Hippopotamus.' N 2 180 CLIMATE AND HABITS OF THE HIPPOPOTAMUS. CHAP. x. He states that, when the Dutch first colonized the Cape of Good Hope, this animal abounded in all the great rivers, as far south as the land extends; whereas, in 1849, they had all disappeared, scarcely one remaining even within a moderate distance of the colony. He also tells us that this species evinces great sagacity in changing its quarters whenever danger threatens, quitting every district invaded by settlers bearing fire-arms. Bulky as they are, they can travel speedily for miles over land from one pool of a dried-up river to another ; but it is by water that their powers of locomotion are surpassingly great, not only in rivers, but in the sea, for they are far from confining themselves to fresh water. Indeed, Dr. Smith finds it ' difficult to decide whether, during the daytime and when not feeding, they prefer the pools of rivers or the waters of the ocean for their abode.' In districts where they have been disturbed by man, they feed almost entirely in the night, chiefly on certain kinds of grass, but also on brushwood. Dr. Smith relates that, in an ex pedition which he made north of Port Natal, he found them swarming in all the rivers about the tropic of Capricorn, Here they were often seen to have left their foot-prints on the sands, entering or coming out of the salt water ; and on one occasion Smith's party tried in vain to intercept a female with her young as she was making her way to the sea. Another female, which they had wounded on her precipitate retreat to the sea, was afterwards shot in that element. The geologist, therefore, may freely speculate on the time when herds of hippopotami issued from North African rivers, such as the Nile, and swam northwards in summer along the coasts of the Mediterranean, or even occasionally visited islands near the shore. Here and there they may have landed to graze or browse, tarrying awhile and afterwards continuing their course northwards. Others may have swum in a few summer days from rivers in the south of Spain or France to CHAP. x. POST-PLIOCENE BURIAL-PLACE, SOUTH OF FRANCE. 181 the Somme, Thames, or Severn, making timely retreat to the south before the snow and ice set in. Burial-place at A urignac, in the South of France, of Post-pliocene Date. I have alluded in the beginning of the fourth chapter (p. 58) to a custom prevalent among rude nations of consigning to the tomb works of art, once the property of the dead or objects of their affection, and even of storing up, in many cases, animal food destined for the manes of the defunct in a future life. I also cited M. Desnoyers' comments on the absence among the bones of wild and domestic animals found in old Gaulish tombs of all intermixture of extinct species of qua drupeds, as proving that the oldest sepulchral monuments then known in France (1845) had no claims to high antiquity founded on palseontological data. M. Lartet, however, has recently published a circumstantial account of what seems clearly to have been a sepulchral vault of the post-pliocene period, near Aurignac, not far from the foot of the Pyrenees. I have had the advantage of inspect ing the fossil bones and works of art obtained by him from that grotto, and of conversing and corresponding with him on the subject, and can see no grounds for doubting the sound ness of his conclusions.* The town of Aurignac is situated in the department of the Haute Graronne, near a spur of the Pyrenees ; adjoining it is the small flat-topped hill of Fajoles, about sixty feet above the brook called Eodes, which flows at its foot on one side. It consists of nummulitic limestone, presenting a steep escarp ment towards the north-west, on which side in the face of the * See Lartet, Annales des Mines, in Natural History Eeview, London, Zoologie, torn. xv. p. 177, translated January 1862. 182 SECTION OF SEPULCHRAL GROTTO AT AURIGNAC. CHAP. x. rock, about forty-five feet above the brook, is now visible the entrance of a grotto, a, fig. 25, which opened originally on the terrace h, c, k, which slopes gently towards the valley. Fig. 25 Section of part of the hill of Fajoles passing through the sepulchral grotto of Aurignac (E. Lartet). a Part of the vault in which the remains of seventeen human skeletons were found. b Layer of made ground, two feet thick, inside the grotto in which a few human bones, with entire bones of extinct and living species of ani mals, and many works of art were embedded. c Layers of ashes and charcoal, eight inches thick, with broken, burnt, and gnawed bones of extinct and recent mammalia; also hearth-stones and works of art ; no human bones. d Deposit with similar contents and a few scattered cinders. e Talus of rubbish washed down from the hill above. /, g Slab of rock which closed the vault, not ascertained whether it ex tended to h. . /, i Eabbit burrow which led to the discovery of the grotto. h, Jc Original terrace on which the grotto opened. N Nummulitic limestone of hill of Fajoles. Until the year 1852, the opening into this grotto was masked by a talus of small fragments of limestone and earthy CHAP. x. DISCOVERY OF HUMAN BONES. 183 matter, e, such as the rain may have washed down the slope of the hill. In that year a labourer named Bonnemaison, employed in repairing the roads, observed that rabbits, when hotly pursued by the sportsman, ran into a hole which they had burrowed in the talus, at i /, fig. 25. On reaching as far into the opening as the length of his arm, he drew out, to his surprise, one of the long bones of the human skeleton ; and his curiosity being excited, and having a suspicion that the hole communicated with a subterranean cavity, he commenced digging a trench through the middle of the talus, and in a few hours found himself opposite a large heavy slab of rock / h, placed vertically against the entrance. Having removed this, he discovered on the other side of it an arched cavity, a, seven or eight feet in its greatest height, ten in width, and seven in horizontal depth. It was almost filled with bones, among which were two entire skulls, which he recognised at once as human. The people of Aurignac, astonished to hear of the occurrence of so many human relics in so lonely a spot, flocked to the cave, and Dr. Amiel, the Mayor, ordered all the bones to be taken out and reinterred in the parish cemetery. But before this was done, having as a medical man a knowledge of anatomy, he ascertained by counting the homologous bones that they must have formed parts of no less than seven teen skeletons of both sexes, and all ages; some so young that the ossification of some of the bones was incomplete. He also remarked that the size of the adults was such as to imply a race of small stature. Unfortunately the skulls were injured in the transfer ; and what is worse, after the lapse of eight years, when M. Lartet visited Aurignac, the village sexton was unable to tell him in what exact place the trench was dug, into which the skeletons had been thrown, so that this rich harvest of ethnological knowledge seems for ever lost to the antiquary and geologist. M. Lartet having been shown, in 1860, the remains of some 184 WORKS OF ART FOUND OUTSIDE THE GROTTO. CHAP. x. extinct animals and works of art, found in digging the original trench made by Bonnemaison through the bed d under the talus, and some others brought out from the interior of the grotto, determined to investigate systematically what remained intact of the deposits outside and inside the vault, those inside, underlying the human skeletons, being supposed to consist entirely of made ground. Having obtained the assistance, of some intelligent workmen, he personally super intended their labours, and found outside the grotto, resting on the sloping terrace h k, the layer of ashes and charcoal c, about seven inches thick, extending over an area of six or seven square yards, and going as far as the entrance of the grotto and no farther, there being no cinders or charcoal in the interior. Among the cinders outside the vault were fragments of fissile sandstone, reddened by heat, which were observed to rest on a levelled surface of nummu- litic limestone and to have formed a hearth. The nearest place from whence such slabs of sandstone could have been brought was the opposite side of the valley. Among the ashes, and in some overlying earthy layers, d, separating the ashes from the talus e, were a great variety of bones and implements ; amongst the latter not fewer than a hundred flint articles knives, projectiles, sling stones, and chips, and among them one of those siliceous cores or nuclei with numerous facets, from which flint flakes or knives had been struck off, seeming to prove that some instruments were occasionally manufactured on the very spot. Among other articles outside the entrance was found a stone of a circular form, and flattened on two sides, with a central depression, composed of a tough rock which does not belong to that region of the Pyrenees. This instrument is supposed by the Danish antiquaries to have been used for re moving by skilful blows the edges of flint knives, the CHAP. x. BONES OF MAMMALIA FOUND AT AURIGNAC. 185 fingers and thumb being placed in the two opposite depressions during the operation. Among the bone instruments were arrows without barbs, and other tools made of rein-deer horn, and a bodkin formed out of the more compact horn of the roe-deer. This instrument was well shaped, and sharply pointed, and in so good a state of preservation that it might still be used for piercing the tough skins of animals. Scattered through the same ashes and earth were the bones of the various species of animals enumerated in the subjoined lists, with the exception of two, marked with an asterisk, which only occurred in the interior of the grotto : 1. CARNIVORA. Number of individuals. 1. Ursus spel&us (cave-bear) 5 - - 6 2. Ursus Arctos ? (brown bear) . . 1 3. Meles Taxus (badger) 1 2 4. Putorius vulgaris (polecat) . . 1 5.*Felis spel&a (cave-lion) 1 6. Felis Catus ferus (wild cat) .... 1 7. Hyana spelcea (cave-hyaena) . . . .5 6 8. Canis Lupus (wolf) 3 9. Canis Vulpes (fox) U8 20 2. HERBIVORA. 1. Elephas primigenius (mammoth, two molars). 2. Ehinoceros tichorhinus (Siberian rhinoceros) . 1 3. Equus Cabcdlus (horse) 12 15 4. Equus Asinus ? (ass) 1 5.*Sus Scrofa (pig, two incisors). 6. Cervus Elephas (stag) 1 7. Megaceros hybernicus (gigantic Irish deer) . . 1 8. G. Capreolus (roebuck) 3 4 9. C. Tarandus (reindeer) 10 12 10. Bison europ&us (aurochs) 12 15 The bones of the herbivora were the most numerous, and all those on the outside of the grotto which had contained marrow were invariably split open, as if for its extraction, many 186 THE RHINOCEROS TICHORINUS EATEN BY MAN. CHAP. x. of them being also burnt. The spongy parts/ moreover, were wanting, having been eaten off and gnawed after they were broken, the work, according to M. Lartet, of hyaenas, the bones and coprolites of which were plentifully mixed with the cinders, and dispersed through the overlying soil d. These beasts of prey are supposed to have prowled about the spot and fed on such relics of the funeral feasts as remained after the retreat of the human visitors, or during the intervals between successive funeral ceremonies which accompanied the interment of the corpses within the sepulchre. Many of the bones were also streaked, as if the flesh had been scraped off by a flint instrument. Among the various proofs that the bones were fresh when brought to the spot, it is remarked that those of the herbivora not only bore the marks of having had the marrow extracted and having afterwards been gnawed and in part devoured as if by carnivorous beasts, but that they had also been acted upon by fire (and this was especially noticed in one case of a cave-bear's bone), in such a manner as to show that they retained in them at the time all their animal matter. Among other quadrupeds which appear to have been eaten at the funeral feasts, and of which the bones occurred among the ashes, were those of a young Rhinoceros tichorhinus, the bones of which had been split open for the extraction of the marrow, and gnawed by a beast of prey at both extremities. Outside of the great slab of stone forming the door, not one human bone occurred ; inside of it there were found, mixed with loose soil, the remains of as many as seventeen human individuals, besides some works of art and bones of animals. We know nothing of the arrangement of these bones when they were first broken into. M. Lartet infers, from the small height and dimensions of the vault, that the bodies were bent down upon themselves in a squatting atti tude, a posture known to have been adopted in most of the sepulchres of primitive times ; and he has so represented them CHAP. x. WORKS OF ART FOUND IN THE GROTTO. 187 in his restoration of the cave. His artist also has inad vertently, in the same drawing, delineated the arched grotto as if it were shaped very regularly and smoothly, like a finished piece of masonry, whereas the surface was in truth as uneven and irregular as are the roofs of all natural grottos. There was no stalagmite in the grotto, and M. Lartet, an experienced investigator of ossiferous caverns in the south of France, came to the conclusion that all the bones and soil found in the inside were artificially introduced. The sub stratum, 6, fig. 25, which remained after the skeletons had been removed, was about two feet thick. In it were found about ten detached human bones, including a molar tooth ; and M. Delesse ascertained by careful analysis of one of these, as well as of the bones of a rhinoceros, bear, and some other extinct animals, that they all contained precisely the same proportion of azote, or had lost an equal quantity of their animal matter. My friend Mr. Evans, before cited, has sug gested to me that such a fact, taken alone, may not be con clusive in favour of the equal antiquity of the human and other remains, although it has no doubt an important bearing on the case, because, had the human skeletons been found to contain less gelatine than those of the extinct mammalia, it would have shown that they were the more modern of the two. But it is possible that after a bone has gone on losing its animal matter up to a certain point, it may then part with no more so long as it continues enveloped in the same matrix, so that if all the bones have lain for many thou sands of years in a particular soil, they may all have reached long ago the maximum of decomposition attainable in such a matrix. In the present case, however, the proof of the con temporaneousness of man and the extinct animals does not depend simply on the identity of their mineral condition. The chemical analysis of M. Delesse is only a fact in corro- boration of a great mass of other evidence. Mixed with the human bones inside the grotto first re- 188 WORKS OF ART FOUND IN THE GROTTO. CHAP. x. moved by Bonnemaison, were eighteen small, round, and flat plates of a white shelly substance, made of some species of cockle (Cardium), pierced through the middle as if for being strung into a bracelet. In the substratum also in the interior examined by M. Lartet was found the tusk of a young Ursus spelceus, the crown of which had been stripped of its enamel, and which had been carved perhaps in imitation of the head of a bird. It was perforated lengthwise as if for suspension as an ornament or amulet. A flint knife also was found in the interior which had evidently never been used; in this respect, unlike the numerous worn specimens found outside, so that it is conjectured that it may, like other associated works of art, have been placed there as part of the funeral ceremonies. A few teeth of the cave-lion, Felis spelcea, and two tusks of the wild boar, also found in the interior, were memorials perhaps of the chase. No remains of the same animals were met with among the external relics. On the whole, the bones of animals inside the vault offer a remarkable contrast to those of the exterior, being all entire and uninjured, none of them broken, gnawed, half-eaten, scraped or burnt like those lying among the ashes on the other side of the great slab which formed the portal. The bones of the interior seem to have been clothed with their flesh, when buried in the layer of loose soil strewed over the floor. In confirmation of this idea, many bones of the skeleton were often observed to be in juxta-position, and in one spot nearly all the bones of an Ursus spelceus were lying together uninjured. Add to this, the entire absence in the interior of cinders and charcoal, and we can scarcely doubt that we have here an example of an ancient place of sepulture, closed at the opening so effectually against the hysenas or other carnivora that no marks of their teeth appear on any of the bones, whether human or brute. CHAP. x. FUNERAL EITES OF INDIANS. 189 John Carver, in his travels in the interior of North" America in 1766-68 (ch. xv.), gave a minute account of the funeral rites of an Indian tribe, which inhabited the country now called Iowa, at the junction of the St. Peter's Eiver with the Mississippi ; and Schiller, iD his famous ' Nadowessische Todtenklage,' has faithfully embodied in a poetic dirge all the characteristic features of the ceremonies so graphically described by the English traveller, not omitting the many funeral gifts which, we are told, were placed c in a cave' with the bodies of the dead. The lines beginning, ' Bringet her die letzten Graben,' have been thus translated, truth fully, and with all the spirit of the original, by Sir E. L. Bulwer * ' Here bring the last gifts ! and with these The last lament be said ; Let all that pleased, and yet may please, Be buried with the dead. ' Beneath his head the hatchet hide, That he so stoutly swung ; And place the bear's fat haunch beside The journey hence is long ! ' And let the knife new sharpened be That on the battle-day Shore with quick strokes he took but three The foeman's scalp away ! ' The paints that warriors love to use, Place here within his hand, That he may shine with ruddy hues Amidst the spirit-land.' If we accept M. Lartet's interpretation of the ossiferous de posits of Aurignac, both inside and outside the grotto, they add nothing to the palseontological evidence in favour of man's antiquity, for we have seen all the same mammalia associated elsewhere with flint implements, and some species, such as the Elephas antiquus, Rhinoceros hemitcechus, and Hippopotamus major, missing here, have been met with in * Poems and Ballads of Schiller. 190 RELATIVE ANTIQUITY OF AURIGNAC FOSSILS. CHAP. x. other places. An argument, however, having an opposite leaning may perhaps be founded on the phenomena of Aurignac. It may, indeed it has been said, that they imply that some of the extinct mammalia survived nearly to our times. Fi rs t ? Because of the modern style of the works of art at Aurignac. Secondlv, Because of the absence of any signs of change in the physical geography of the country since the cave was used for a place of sepulture. In reference to the first of these propositions, the utensils, it is said, of bone and stone indicate a more advanced state of the arts than the flint implements of Abbeville and Amiens. M. Lartet, however, is of opinion that they do not, and thinks that we have no right to assume that the fabricators of the various spear-headed and other tools of the Valley of the Somme possessed no bone instruments or ornaments resem bling those discovered at Aurignac. These last, moreover, he regards as extremely rude in comparison with others of the stone period in France, which can be proved palseontologically, at least by strong negative evidence, to be of subsequent date. Thus, for example, at Savigne, near Civray, in the department of Vienne, there is a cave in which there are no extinct mam malia, but where remains of the rein-deer abound. The works of art of the stone period found there indicate con siderable progress in skill beyond that attested by the objects found in the Aurignac grotto. Among the Savigne articles, there is a stag's horn, on which figures of two animals, ap parently meant for deer, are engraved in outline, as if by a sharp-pointed flint. In another cave, that of Massat, in the department of Arriege, which M. Lartet ascribes to the period of the aurochs, a quadruped which survived the rein-deer in the south of France, there are bone instruments of a still more advanced state of the arts, as, for example, barbed arrows CHAP. X. RELATIVE ANTIQUITY OF AURIGNAC FOSSILS. 191 with a small canal in each, believed to have served for the insertion of poison ; also a needle of bird's bone, finely shaped, with an eye or perforation at one end, and a stag's horn, on which is carved a representation of a bear's head, and a hole at one end as if for suspending it. In this figure we see, says M. Lartet, what may perhaps be the earliest known example of lines used to express shading. The fauna of the aurochs (Bison europceus) agrees with that of the earlier lake dwellings in Switzerland, in which hitherto the rein-deer is wanting ; whereas the rein-deer has been found in a Swiss cave, in Mont Saleve, supposed by Lartet to be more ancient than the lake dwellings. According to this view, the mammalian fauna has undergone at least two fluctuations since the remains of some extinct quadrupeds were eaten, and others buried as funeral gifts in the sepulchral vault of Aurignac. As to the absence of any marked changes in the physical configuration of the district since the same grotto was a place of sepulture, we must remember that it is the normal state of the earth's surface to be undergoing great alterations in one place, while other areas, often in close proximity, remain for ages without any modification. In one region, rivers are deepening and widening their channels, or the waves of the sea are undermining cliffs, or the land is sinking beneath or rising above the waters, century after century, or the volcano is pouring forth torrents of lava or showers of ashes ; while, in tracts -hard by, the ancient forest, or extensive heath, or the splendid city continue scatheless and motionless. Had the talus which concealed from view the ancient hearth with its cinders and the massive stone portal of the Aurignac grotto escaped all human interference for thousands of years to come, there is no reason to suppose that the small stream at the foot of the hill of Fajoles would have undermined it. At the end of a long period the only alteration might have 192 EELATIVE ANTIQUITY OF AURIGNAC FOSSILS. CHAP. x. been the thickening of the talus which protected the loose cinders and bones from waste. We behold in many a valley of Auvergne, within fifty feet of the present river channel, a volcanic cone of loose ashes, with a crater at its summit, from which powerful currents of basaltic lava have poured, usurping the ancient bed of the torrent. By the action of the stream, in the course of ages, vast masses of the hard columnar basalt have been removed, pillar after pillar, and much vesicular lava, as in the case, for example, of the Puy Eouge, near Chalucet, and of the Puy de Tartar et, near Nechers.* The rivers have even in some cases, as the Sioule, near Chalucet, cut through not only the basalt which dispossessed them of their ancient channels, but have actually eaten fifty feet into the subjacent gneiss ; yet the cone, an incoherent heap of scoria3 and spongy ejectamenta, stands unmolested. Had the waters once risen, even for a day, so high as to reach the level of the base of one of these cones had there been a single flood fifty or sixty feet in height since the last eruption oc curred, a great part of these volcanoes must inevitably have been swept away as readily as all traces of the layer of cinders ; and the accompanying bones would have been obliterated by the Rodes near Aurignac, had it risen, since the days of the mammoth, rhinoceros, and cave-bear, fifty feet above its present level. The Aurignac cave adds no new species to the list of extinct quadrupeds, which we have elsewhere, and by inde pendent evidence, ascertained to have once flourished con temporaneously with man. But if the fossil memorials have been correctly interpreted if we have here before us at the northern base of the Pyrenees a sepulchral vault with skeletons of human beings, consigned by friends and relatives to their last resting-place if we have also at the * Scrope's Volcanoes of Central France, p. 97, 1858. CHAP. x. BURIAL RITES OF POST-PLIOCENE PERIOD. 193 portal of the tomb the relics of funeral feasts, and within it indications of viands destined for the use of the departed on their way to a land of spirits ; while among the funeral gifts are weapons wherewith in other fields to chase the gigantic deer, the cave-lion, the cave-bear, and woolly rhinoceros, we have at last succeeded in tracing back the sacred rites of burial, and, more interesting still, a belief in a future state, to times long anterior to those of history and tradition. Rude and superstitious as may have been the savage of that remote era, he still deserved, by cherishing hopes of a here after, the epithet of ' noble,' which Dryden gave to what he seems to have pictured to himself as the primitive condition of our race : ' as Nature first made man When wild in woods the noble savage ran.' * Siege of Granada, Part I., act i. scene 1. 194 HUMAN FOSSILS OF LE PUT AND NATCHEZ. CHAP xi. CHAPTER XL AGE OF HUMAN FOSSILS OF LE PUT IN CENTRAL FRANCE AND OF NATCHEZ ON THE MISSISSIPPI, DISCUSSED. QUESTION AS TO THE AUTHENTICITY OF THE FOSSIL MAN OF DENISE, NEAR LE PUY-EN-VELAY, CONSIDERED ANTIQUITY OF THE HUMAN RACE IMPLIED BY THAT FOSSIL SUCCESSIVE PERIODS OF VOLCANIC ACTION IN CENTRAL FRANCE WITH WHAT CHANGES IN THE MAM MALIAN FAUNA THEY CORRESPOND THE ELEPHAS MERIDIONALIS ANTERIOR IN TIME TO THE IMPLEMENT-BEARING GRAVEL OF ST. ACHEUL AUTHENTICITY OF THE HUMAN FOSSIL OF' NATCHEZ ON THE MISSIS SIPPI, DISCUSSED THE NATCHEZ DEPOSIT, CONTAINING BONES OF MAS TODON AND MEGALONYX, PROBABLY NOT OLDER THAN THE FLINT IMPLEMENTS OF ST. ACHEUL. AMONG- the fossil remains of the human species supposed to have claims to high antiquity, and which have for many years attracted attention, two of the most prominent examples are First, f The fossil man of Denise,' comprising the re mains of more than one skeleton, found in a volcanic breccia near the town of Le Puy-en-Velay, in Central France. Secondly, The fossil human bone of Natchez, on the Mis sissippi, supposed to have been derived from a deposit con taining remains of mastodon and megalonyx. Having carefully examined the sites of both of these celebrated fossils, I shall consider in this chapter the nature of the evidence on which the remote date of their entombment is inferred. Fossil Man of Denise, An account of the fossil remains, so called, was first published in 1844, by M. Aymard of Le Puy, a writer of deservedly CHAP. xi. FOSSIL MAN OF DENISE. 195 high authority both as a palaeontologist and archaeologist.* M. Pictet, after visiting Le Puy and investigating the site of the alleged discovery, was satisfied that the fossil bones belonged to the period of the last volcanic eruptions of Velay ; but expressly stated in his important treatise on palaeontology that this conclusion, though it might imply that man had coexisted with the extinct elephant, did not draw with it the admission that the human race was anterior in date to the filling of the caverns of France and Belgium with the bones of extinct mammalia.f At a meeting of the ' Scientific Congress ' of France, held at Le Puy in 1856, the question of the age of the Denise fossil bones was fully gone into, and in the report of their proceedings published in that year, the opinions of some of the most skilful osteologists respecting the point in con troversy are recorded. The late Abbe Croizet, a most experienced collector of fossil bones in the volcanic regions of Central France, and an able naturalist, and the late M. Laurillard, of Paris, who assisted Cuvier in modelling many fossil bones, and in the arrangement of the museum of the Jardin, declared their opinion that the specimen preserved in the museum of Le Puy is no counterfeit. They believed the human bones to have been enveloped by natural causes in the tufaceous matrix in which we now see them. In the year 1859, Professor Hebert and M. Lartet visited Le Puy, expressly to investigate the same specimen, and to inquire into the authenticity of the bones and their geological age. Later in the same year, I went myself to Le Puy, having the same object in view, and had the good fortune to meet there my friend Mr. Poulett Scrope, with whom I ex amined the Montagne de Denise, where "a peasant related to us how he had dug out the specimen with his own hands and * Bulletin de la Societe Geologique f Trait6 de Paleontologie, torn. i. de France, 1844, 1845, 1847. p. 152, 1853. o 2 196 AGE OF FOSSIL MAN OF DEMISE, CHAP. xi. in his own vineyard, not far from the summit of the volcano. I employed a labourer to make under his directions some fresh excavations, following up those which had been made a month earlier by MM. Hebert and Lartet, in the hope of verifying the true position of the fossils, but all of us without success. We failed even to find in situ any exact counterpart of the stone of the Le Puy Museum. The osseous remains of that specimen consist of a frontal and some other parts of the skull, including the upper jaw with teeth, both of an adult and young individual ; also a radius, some lumbar vertebrae, and some metatarsal bones. They are all embedded in a light porous tuff, resembling in colour and mineral composition the ejectamenta of several of the latest eruptions of Denise. But none of the bones pene trate into another part of the same specimen, which consists of a more compact rock thickly laminated. Nevertheless, I agree with the Abbe Croizet and M. Aymard, that it is not conceivable even that the less coherent part of the museum specimen which envelopes the human bones should have been artificially put together, whatever may have been the origin of certain other slabs of tuff which were afterwards sold as coming from the same place, and which also contained human remains. Whether some of these were spurious or not is a question more difficult to decide. One of them, now in the possession of M. Pichot-Dumazel, an advocate of Le Puy, is suspected of having had some plaster of Paris introduced into it to bind the bones more firmly together in the loose vol canic tuff. I was assured that a dealer in objects of natural history at Le Puy had been in the habit of occasionally se curing the cohesion in that manner of fragments of broken bones, and the juxta-position of uninjured ones found free and detachable in loose volcanic tuffs. From this to. the fabrication of a factitious human fossil was, it is suggested, but a short step. But in reference to M. Pichot's specimen, CHAP. xi. NEAK LE PUY-EN-VELAY. 197 an expert anatomist remarked to me that it would far exceed the skill, whether of the peasant who owned the vineyard or of the dealer above mentioned, to put together in their true position all the thirty-eight bones of the hand and fingers, or the sixteen of the wrist, without making any mistake, and especially without mixing those of the right with the ho mologous bones of the left hand, assuming that they had brought bones, from some other spot, and then artificially introduced them into a mixture of volcanic tuff and plaster of Paris. Granting, however, that the high prices given for ( human fossils ' at Le Puy may have led to the perpetration of some frauds, it is still an interesting question to consider whether the admission of the genuineness of a single fossil, such as that now in the museum at Le Puy, would lead us to assign a higher antiquity to the existence of man in France than is deducible from many other facts explained in the last seven chapters. In reference to this point, I may observe, that although I was not able to fix with precision the exact bed in the volcanic mountain from which the rock containing the human bones was taken, M. Felix Eobert has, nevertheless, after studying ( the volcanic alluviums ' of Denise, ascer tained that, on the side of Cheyrac and the village of Malouteyre, blocks of tufif frequently occur exactly like the one in the museum. That tuff he considers a product of the latest eruption of the volcano. In it have been found the remains of Hycena spelcea and Hippopotamus major. The eruptions of steam and gaseous matter which burst forth from the crater of Denise broke through laminated o tertiary clays, small pieces of which, some of them scarcely altered, others half converted into scoriaB, were cast out in abundance, while other portions must have been in a state of argillaceous mud. Showers of such materials would be styled by the Neapolitans '. aqueous lava ' or ' lava d' aqua,' 198 VOLCANIC ACTION IN CENTRAL FRANCE. CHAP. XT. and we may well suppose that some human individuals, if any existed, would, together with wild animals, be occa sionally overwhelmed in these tuffs. From near the place on the mountain whence the block with human bones now in the museum is said to have come, a stream of lava, well marked by its tabular structure, flowed down the flanks of the hill, within a few feet of the alluvial plain of the Borne, a small tributary of the Loire, on the opposite bank of which stands the town of Le Puy. Its continuous extension to so low a level clearly shows that the valley had already been deepened to within a few feet of its present depth at the time of the flowing of the lava. We know that the alluvium of the same district, having a similar relation to the present geographical outline of the valleys, is of post-pliocene date, for it contains around Le Puy the bones of Elephas primigenius and Rhinoceros ticho- rhinus ; and this affords us a palseontological test of the age of the human skeleton of Denise, if the latter be assumed to be coeval with the lava stream above referred to. It is important to dwell on this point, because some geolo gists have felt disinclined to believe in the genuineness of the ' fossil man of Denise,' on the ground that, if conceded, it would imply that the human race was contemporary with an older fauna, or that of the Elephas meridionalis. Such a fauna is found fossil in another layer of tuff covering the slope of Denise, opposite to that where the museum specimen was exhumed. The quadrupeds obtained from that more ancient tuff comprise Elephas meridionalis, Hippopotamus major, Rhinoceros megarhinus, Antilope torticornis, Hycena brevi- rostris, and twelve others of the genera horse, ox, stag, goat, tiger, &c., all supposed to be of extinct species. This tuff, found between Malouteyre and Polignac, M. Robert regards as the product of a much older eruption, and referable to the neighbouring Montague de St. Anne, a volcano in a much CHAP. xi. CORRESPONDING MAMMALIAN FAUNA. 199 more wasted and denuded state than Denise, and classed by M. Bertrand de Doue as of intermediate age between the ancient and modern cones of Velay. The fauna to which Elephas meridionalis and its associates belong, can be shown to be of anterior date, in the north of France, to the flint implements of St. Acheul, by the follow ing train of reasoning. The Valley of the Seine is not only geographically contiguous to the Valley of the Somme, but its ancient alluvium contains the same mammoth and other fossil species. The Eure, one of the tributaries of the Seine, in its way to join that river, flows in a valley which follows a line of fault in the chalk ; and this valley is seen to be comparatively modern, because it intersects at St. Prest, four miles below Chartres, an older valley belonging to an anterior system of drainage, and which has been filled by a more ancient fluviatile alluvium, consisting of sand and gravel, ninety feet thick. I have examined the site of this older drift, and the fossils have been determined by Dr. Falconer. They comprise Elephas meridionalis, a species of rhinoceros (not R. tichorhinus), and other mammalia differing from those of the implement-bearing gravels of the Seine and Somme. The latter, belonging to the period of the mammoth, might very well have been contemporary with the modern vol canic eruptions of Central France ; and we may presume, even without the aid of the Denise fossil, that man may have wit nessed these. But the tuffs and gravels in which the Elephas meridionalis are embedded were synchronous with an older epoch of volcanic action, to which the cone of St. Anne, near Le Puy, and many other mountains of M. Bertrand de Doue's middle period belong, having cones and craters, which have undergone much waste by aqueous erosion. We have as yet no proof that man witnessed the origin of these hills of lava and scoriae of the middle phase of volcanic action. Some surprise was expressed in 1856, by several of the 200 HUMAN FOSSIL OF NATCHEZ. CHAP. XT. assembled naturalists at Le Puy, that the skull of the c fossil man of Denise,' although contemporary with the mammoth, and coeval with the last eruptions of the Le Puy volcanoes, should be of the ordinary Caucasian or European type ; but the observations of Professor Huxley on the Engis skull, cited in the fifth chapter, showing the near approach of that ancient cranium to the European standard, will help to remove this source of perplexity. Human Fossil of Natchez on the Mississippi. I have already alluded to Dr. Bowler's attempt to calculate, in years, the antiquity of the human skeleton said to have been buried under four cypress forests in the delta of the Mississippi, near New Orleans (see page 43). In that case no remains of extinct animals were found associated with those of man : but in another part of the basin of the Mississippi, a human bone, accompanied by bones of the mastodon and megalonyx, is supposed to have been washed out of a more ancient alluvial deposit. After visiting the spot in 1846, I described the geological position of the bones, and discussed their probable age, with Fig. 26 1 Modern alluvium of the Mississippi. 2 Loam or loess. 3, / Eocene. 4 Cretaceous. a stronger bias, I must confess, as to the antecedent improba bility of the contemporaneous entombment of man and the mastodon than any geologist would now be justified in entertaining. In the latitude of Vicksburg 32 50' N., the broad, flat, alluvial plain of the Mississippi, a b, fig. 26, is bounded on CHAP. XI. SHELLS OF THE NATCHEZ DEPOSIT. 201 its eastern side by a table-land, d e, about two hundred feet higher than the river, and extending twelve miles eastward with a gentle upward slope. This elevated platform ends abruptly at d, in a line of perpendicular cliffs or bluffs, the base of which is continually undermined by the great river. The table-land, d e, consists at Vicksburg, through which the annexed section, fig. 26, passes, of loam, overlying the tertiary strata, //. Between the loam and the tertiary for mation there is usually a deposit of stratified sand and gravel, containing large fragments of silicified corals and the wreck of older palaeozoic rocks. The age of this inter vening drift, which is one hundred and forty feet thick at Natchez, has not yet been determined ; but it may possibly belong to the glacial period. Natchez is about eighty miles in a straight line south of Vicksburg, on the same left bank of the Mississippi. Here there is a bluff, the upper sixty feet of which consists of a continuous portion of the same calcareous loam as at Vicksburg, equally resembling the Ehenish loess in mineral character and in being sometimes barren of fossils, sometimes so full of them that bleached land-shells stand out conspicuously in relief in the vertical and weathered face of cliffs which form the banks of streams, everywhere intersecting the loam. So numerous are the shells that I was able to collect at Natchez, in a few hours, in 1846, no less than twenty species of the genera Helix, Helicina, Pupa, Cydostoma, Achatina, and Succinea, all identical with shells now living in the same country ; and in one place I observed (as happens also occa sionally in the valley of the Ehine) a passage of the loam with land-shells into an underlying marly deposit of sub aqueous origin, in which shells of the genera Limnea, Planorbis, Paludina, Physa, and Cyclas, were embedded, also consisting of recent American species. Such deposits, more distinctly stratified than the loam . containing land- 202 HUMAN FOSSIL OF NATCHEZ. CHAP. xi. shells, are produced, as before stated, p. 129, in all great alluvial plains, where the river shifts its position, and where marshes, ponds, and lakes are formed in its old deserted channels. In this part of America, however, it may have happened that some of these lakes were caused by partial subsidences, such as were witnessed, during the earthquakes of 1811-12, around New Madrid, in the valley of the Mississippi. Owing to the destructible nature of the yellow loam, d e, fig. 26, every streamlet flowing over the platform has cut for itself, in its way to the Mississippi, a deep gully or ravine ; and this erosion has of late years, especially since 1812, proceeded with accelerated speed, ascribable in some degree to the partial clearing of the native forest, but partly also to the effects of the earthquake of 1811-12. By that con vulsion the region around Natchez was rudely shaken and much fissured. One of the narrow valleys near Natchez, due to this fissuring, is now called the Mammoth Ravine. Though no less than seven miles long, and in some parts sixty feet deep, I was assured by a resident proprietor, Colonel Wiley, that it had no existence before 1812. With its numerous ramifications, it is said to have been entirely formed since the earthquake at New Madrid. Before that event, Colonel Wiley had ploughed some of the land exactly over a spot now traversed by part of this water-course. I satisfied myself that the ravine had been considerably en larged and lengthened a short time before my visit, and it was then freshly undermined and undergoing constant waste. From a clayey deposit immediately below the yellow loam, bones of the Mastodon ohioticus, a species of megalonyx, bones of the genera Equus, Bos, and others, some of extinct and others presumed to be of living species, had been detached, and had fallen to the base of the cliffs. Mingled with the rest, the pelvic bone of a man., os innominatum, CHAP. xr. AGE OF THE NATCHEZ DEPOSIT. 203 was obtained by Dr. Dickeson of Natchez, in whose collection I saw it. It appeared to be quite in the same state of pre servation, and was of the same black colour as the other fossils, and was believed to have come like them from a depth of about thirty feet from the surface. In my ( Second Visit to America,' in 1846,* I suggested, as a possible explanation of this association of a human bone with remains of a mastodon and megalonyx, that the former may possibly have been derived from the vegetable soil at the top of the cliff, whereas the remains of extinct mammalia were dislodged from a lower position, and both may have fallen into the same heap or talus at the bottom of the ravine. The pelvic bone might, I con ceived, have acquired its black colour by having lain for years or centuries in a dark superficial peaty soil, common in that region. I was informed that there were many human bones, in old Indian graves in the same district, stained of as black a die. On suggesting this hypothesis to Colonel Wiley, of Natchez, I found that the same idea had already occurred to his mind. No doubt, had the pelvic bone belonged to any recent mammifer other than man, such a theory would never have been resorted to; but so long as we have only one isolated case, and are without the testimony of a geologist who was present to behold the bone when still engaged in the matrix, and to extract it with his own hands, it is allowable to suspend our judgment as to the high antiquity of the fossil. If, however, I am asked whether I consider the Natchez loam, with land-shells and the bones of mastodon and megalonyx, to be more ancient than the alluvium of the Somme containing flint implements and the remains of the mammoth and hyaena, I must declare that I do not. Both in Europe and America the land and freshwater shells accom panying the extinct pachyderms are of living species, and I could detect no shell in the Natchez loam so foreign to the * Vol. ii. p. 197. 204 GREAT ANTIQUITY OF NATCHEZ LOAM. CHAP. xi. basin of the Mississippi as is the Cyrena fluminalis to the rivers of modern Europe. If, therefore, the relative ages of the Picardy and Natchez alluvium were to be decided on conchological data alone, the fluvio-marine beds of Abbeville might rank as a shade older than the loess of Natchez. My reluctance in 1846 to regard the fossil human bone as of post- pliocene date arose in part from the reflection that the ancient loess of Natchez is anterior in time to the whole modern delta of the Mississippi. The table-land, d e, fig. 26, p. 200, was, I believe, once a part of the original alluvial plain or delta of the great river before it was upraised. It has now risen more than two hundred feet above its pristine level. After the upheaval, or during it, the Mississippi cut through the old fluviatile formation of which its bluffs are now formed, just as the Ehine has in many parts of its valley ex cavated a passage through its ancient loess. If I was right in calculating that the present delta of the Mississippi has required, as a minimum of time, more than one hundred thousand years for its growth,* it would follow, if the claims of the Natchez man to have coexisted with the mastodon are admitted, that North America was peopled more than a thou sand centuries ago by the human race. But even were that true, we could not presume, reasoning from ascertained geological data, that the Natchez bone was anterior in data to the antique flint hatchets of St. Acheul. When we ascend the Mississippi from Natchez to Vicksburg, and then enter the Ohio, we are accompanied everywhere by a continuous fringe of terraces of sand and gravel at a certain height above the alluvial plain, first of the great river, and then of its tributary. We also find that the older alluvium contains the remains of mastodon everywhere, and in some places, as at Evansville, those of the megalonyx. As in the valley of the Somme in Europe, those old post-pliocene gravels often occur * See Principles of Geology. CHAT>. xi. AGE OF NATCHEZ FOSSIL MAN. 205 at more than one level, and the ancient mounds of the Ohio, with their works of art, described at p. 39, are newer than the old terraces of the mastodon period, just as the (rallo- Koman tombs of St. Acheul or the Celtic weapons of the Abbeville peat are more modern than the tools of the mam moth-bearing alluvium. In the first place, I may remind the reader that the vertical movement of two hundred and fifty feet, required to elevate the loess of Natchez to its present height, is exceeded by the upheaval which the marine stratum of Cagliari, containing pottery, has been ascertained by Count de la Marmora to have experienced, p. 177. Such changes of level, therefore, have actually occurred in Europe in the human epoch, and may therefore have happened in America. In the second place, I may observe that, if, since the Natchez mastodon was embedded in clay, the delta of the Mississippi has been formed, so, since the mammoth and rhinoceros of Abbeville and Amiens were enveloped in fluviatile mud and gravel, together with flint tools, a great thickness of peat has accumulated in the Valley of the Somme ; and antecedently to the first growth of peat, there had been time for the extinction of a great many mam malia, requiring, perhaps, as shown at p. 144, a lapse of ages many times greater than that demanded for the for mation of thirty feet of peat, for since the earliest growth of the latter there has been no change in the species of mammalia in Europe. Should future researches, therefore, confirm the opinion that the Natchez man coexisted with the mastodon, it would not enhance the value of the geological evidence in favour of man's antiquity, but merely render the delta of the Mississippi available as a chronometer, by which the lapse of post-pliocene time could be measured somewhat less vaguely than by any means of measuring which have as yet been discovered or rendered available in Europe. 206 CHRONOLOGICAL RELATIONS CHAP. x:i. CHAPTER XII. ANTIQUITY OF MAN RELATIVELY TO THE GLACIAL PERIOD AND TO THE EXISTING FAUNA AND FLORA. CHRONOLOGICAL RELATION OF THE GLACIAL PERIOD, AND THE EARLIEST KNOWN SIGNS OF MAN'S APPEARANCE IN EUROPE SERIES OF TERTIARY DEPOSITS IN NORFOLK AND SUFFOLK IMMEDIATELY ANTECEDENT TO THE GLACIAL PERIOD GRADUAL REFRIGERATION OF CLIMATE PROVED BY THE MARINE SHELLS OF SUCCESSIVE GROUPS MARINE NEWER PLIOCENE SHELLS OF NORTHERN CHARACTER, NEAR WOODBRIDGE . SECTION OF THE NORFOLK CLIFFS NORWICH CRAG FOREST BED AND FLUVIO-MARINE STRATA FOSSIL PLANTS AND MAMMALIA OF THE SAME OVERLYING BOULDER CLAY AND CONTORTED DRIFT NEWER FRESHWATER FORMATION OF MUNDESLEY COMPARED TO THAT OF HOXNE GREAT OSCILLATIONS OF LEVEL IMPLIED BY THE SERIES OF STRATA IN THE NORFOLK CLIFFS EARLIEST KNOWN DATE OF MAN LONG SUBSEQUENT TO THE EXISTING FAUNA AND FLORA. THEEQUENT allusions have been made in the preceding J- pages to a period called the glacial, to which no refe rence is made in the Chronological Table of Formations given at p. 7. It comprises a long series of ages, chiefly of post- tertiary date, during which the power of cold, whether exerted by glaciers on the land, or by floating ice on the sea, was greater in the northern hemisphere, and extended to more southern latitudes than now. It often happens that when in any given region we have pushed back our geological investigations as far as we can, in search of evidence of the first appearance of man in Europe, we are stopped by arriving at what is called the e boulder clay ' or * northern drift.' This formation is usually quite destitute of organic remains, so that the thread of our in quiry into the history of the animate creation, as well as of man, is abruptly cut short. The interruption, however, is by CHAP. xil. OF THE GLACIAL AND HUMAN PERIODS. 207 no means encountered at the same point of time in every district. In the case of the Danish peat, for example, we get no farther back than the recent period of our Chrono logical Table (p. 7), and then meet with the boulder clay ; and it is the same in the valley of the Clyde, where the marine strata contain the ancient canoes before described (p. 47), and where nothing intervenes between that recent for mation and the glacial drift. But we have seen that, in the neighbourhood of Bedford (p. 155), the memorials of man can be traced much farther back into the past, namely, into the post-pliocene epoch, when the human race was contemporary with the mammoth and many other species of mammalia now extinct. Nevertheless, in Bedfordshire as in Denmark, the formation next antecedent in date to that containing the human implements is still a member of the glacial drift, with its erratic blocks. If the reader remembers what was stated in the Eighth Chapter, p. 144, as to the absence or extreme scarcity of human bones and works of art in all strata, whether marine or fresh-water, even in those formed in the immediate prox imity of land inhabited by millions of human beings, he will be prepared for the general dearth of human memorials in glacial formations, whether recent, post-pliocene, or of more ancient date. If there were a few wanderers over lands covered with glaciers, or over seas infested with ice-bergs, and if a few of them left their bones or weapons in moraines or in marine drift, the chances, after the lapse of thousands of years, of a geologist meeting with one of them must be infini- tesimally small. It is natural, therefore, to encounter a gap in the. regular sequence of geological monuments bearing on the past history of man, wherever we have proofs of glacial action having prevailed with intensity, as it has done over large parts of Europe and North America, in the post-pliocene period. As 208 INCREASING COLD SHOWN BY CHAP. xn. we advance into more southern latitudes approaching the 50th parallel of latitude in Europe, and the 40th in North America, this disturbing cause ceases to oppose a bar to our inquiries ; but even then, in consequence of the fragmentary nature of all geological annals, our progress is inevitably slow in constructing any thing like a connected chain of history, which can only be effected by bringing the links of the chain found in one area to supply the information which is wanting in another. The least interrupted series of consecutive documents to which we can refer in the British Islands, when we desire to connect the tertiary with the post-tertiary periods, are found in the counties of Norfolk, Suffolk, and Essex ; and I shall speak of them in this chapter, as they have a direct bearing on the relations of the human and glacial periods, which will be the subject of several of the following chapters. The fossil shells of the deposits in question clearly point to a gradual refrigeration of climate, from a temperature some what warmer than that now prevailing in our latitudes to one of intense cold ; and the successive steps which have marked the coming on of the increasing cold are matters of no small geological interest. It will be seen in the Table at p. 7, that next before the post-tertiary period stands the pliocene, divided into the older and newer. The shelly and sandy beds representing these periods in Norfolk and Suffolk are termed provincially Crag, having under that name been long used in agriculture to fertilise soils deficient in calcareous matter, or to render them less stiff and impervious. In Suffolk, the older pliocene strata called Crag are divisible into the Coralline and the Eed Crags, the former being the older of the two. In Norfolk, a more modern formation, commonly termed the 6 Norwich,' or sometimes the < mammalif erous ' Crag, which is referable to the newer pliocene period, occupies large areas. CHAP. XII. NORFOLK AND SUFFOLK TERTIARIES. 209 We are indebted to Mr. Searles Wood, F.Gr.S., for an admirable monograph on the fossil shells of these British pliocene formations. He has not himself given us an ana lysis of the results of his treatise, but the following tables have been drawn up for me by Mr. S. P. Woodward, the well- known author of the 6 Manual of the Mollusca, Eecent and Fossil' (London, 1853-6), in order to illustrate some of the general conclusions to which Mr. Wood's careful examination of 442 species of mollusca has led. Number of known Species of Marine Testacea in the three English Pliocene Deposits, called the Norwich, the Red, and the Coralline Crags. Brachiopoda Conchifera Gasteropoda Total 6 206 230 442 Distribution of the above Marine Testacea. Number of Species. Norwich Crag . . . .81 Bed Crag .... . . 225 Coralline Crag . . .327 Species common to the Norwich and Ked Crag (not in Cor. ) 33 Norwich and Coralline ( not in Ked) 4 Ked and Coralline (not in Norwich) 116 Norwich, Ked, and Coralline . 19* Proportion of Eecent to Extinct Species. Recent. Norwich Crag . . . .69 Ked Crag 130 Coralline Crag . . . .168 Extinct. 12 95 159 Per-centage of Recent. 85 57 51 Recent Species not living now in British Seas. Norwich Crag Ked Crag Coralline Crag Northern Species. . 12 . 8 2 Southern. 16 27 * These 19 species must be added to the numbers 33, 4, and 116 respectively in order to obtain the full amount of common species in each of those cases. 210 INCKEASING COLD SHOWN BY CHAP. xn. In the above list I have not included the shells of the glacial beds of the Clyde and of several other British deposits of newer origin than the Norwich Crag, in which nearly all perhaps all the species are recent. The land and fresh water shells, thirty-two in number, have also been purposely omitted, as well as three species of London Clay shells, sus pected by Mr. Wood himself to be spurious. By far the greater number of the recent marine species included in these tables are still inhabitants of the British seas ; but even these differ considerably in their relative abundance, some of the commonest of the Crag shells being now extremely scarce; as, for example, Buccinum Dalei, and others, rarely met with in a fossil state, being now very common, as Murex erinaceus and Cardium echinatum. The last table throws light on a marked alteration in the climate of the three successive periods. It will be seen that in the Coralline Crag there are twenty-seven southern shells, including twenty-six Mediterranean, and one West Indian species (JErato Maugerice). Of these only thirteen occur in the Eed Crag, associated with three new southern species, while the whole of them disappear from the Norwich beds. On the other hand, the Coralline Crag contains only two arctic shells, Admete viridula and Limopsis pygmcea ; whereas the Eed Crag contains, as stated in the table, eight northern species, all of which recur in the Norwich Crag, with the addition of four others, also inhabitants of the arctic regions ; so that there is good evidence of a continual refrigeration of climate during the pliocene period in Britain. The presence of these northern shells cannot be explained away by sup posing that they were inhabitants of the deep parts of the sea; for some of them, such as Tellina calcarea and Astarte borealis, occur plentifully, and sometimes with the valves united by their ligament, in company with other littoral shells, such as Mya arenaria and Littorina rudis, and evidently CHAP. xii. NORFOLK AND SUFFOLK TERTIAKIES. 211 not thrown up from deep water. Yet the northern character of the Norwich Crag is not fully shown by simply saying that it contains twelve northern species, now no longer found in British seas, since several boreal shells which still linger in the Scottish deeps do not abound there as they did in the latter days of the Crag period. It is the predominance of certain genera and species which satisfies the mind of a conch ologist as to the arctic character of the Norwich Crag. In like manner, it is the presence of such genera as Pyrula, Columbella, Terebra, Cassidaria, Pholadomya, Lingula, Discina, and others which give a southern aspect to the Coralline Crag shells. The cold, which had gone on increasing from the time of the Coralline to that of the Norwich Crag, continued, though not perhaps without some oscillations of temperature, to become more and more severe after the accumulation of the Norwich Crag, until it reached its maximum in what has been called the glacial epoch. The marine fauna of this last period contains, both in Ireland and Scotland, recent species of mollusca now living in Greenland and other seas far north of the areas where we find their remains in a fossil state. The refrigeration of climate from the time of the older to that of the newer Pliocene strata is not now announced for the first time, as it was inferred from a study of the Crag shells in 1846 by the late Edward Forbes.* The most southern point to which the marine beds of the Norwich Crag have yet been traced is at Chillesford, near Woodb ridge, in Suffolk, about eighty miles north-east of London, where, as Messrs. Prestwich and Searles Wood have pointed out,f they exhibit decided marks of having been deposited in a sea of a much lower temperature than that now prevailing in the same latitude. Out of twenty-three shells * Manual of Geological Survey, f Quarterly Geological Journal, London, 1846, p. 391. 1849, vol. v. p. 345. P 2 212 CHILLESFOED ARCTIC SHELLS. CH.4P. xn. obtained in that locality from argillaceous strata twenty feet thick, two only, namely, Nucula Cobboldice and Tellina obliqua, are extinct, and not a few of the other species, such as Leda arctica, Cardium groenlandicum, Lucina borealis, Cyprina islandica, Panopcea norvegica, and Mya truncata, betray a northern, and some of them an arctic character. These Chillesford beds are supposed to be somewhat more modern than any of the purely marine strata of the Norwich Crag exhibited by the sections of the Norfolk cliffs NW. of Cromer, which I am about to describe. Yet they probably preceded in date the ' Forest Bed ' and fluvio-marine deposits of those same cliffs. They are, therefore, of no small im portance in reference to the chronology of the glacial period, since they afford evidence of an assemblage of fossil shells with a proportion of between eight and nine in a hundred of extinct species occurring so far south as lat. 53 N., and indi cating so cold a climate as to imply that the glacial period commenced before the close of the newer pliocene era. The annexed section will give a general idea of the ordinary succession of the newer pliocene and post-pliocene strata which rest upon the chalk in the Norfolk and Suffolk cliffs. These cliffs vary in height from fifty to above three hundred feet. At the north-western extremity of the section at Weybourne (beyond the limits of the annexed diagram), and from thence to Cromer, a distance of seven miles, the Norwich crag, a marine deposit, reposes immediately upon the chalk. A vast majority of its shells are of living species now inhabiting the British seas, such as Cardium edule, Cyprina islandica, and Scalaria groenlandica, and some few extinct, as Fusus striatus, Tellina obliqua^ and Nucula Cobboldice. At Cromer jetty this for mation thins out, as expressed in the diagram at A ; and to the south we find No. 3, or what is commonly called the ' Forest Bed,' reposing immediately upon the chalk, and occupying as it were the place previously held by the marine crag No. 2. <0 213 *:;;:: o iiiii C s &-$ CO co i^ 214 SECTION OF NORFOLK CLIFFS. CHAF. xn. This buried forest has been traced for more than forty miles, being exposed at certain seasons and states of the beach between high and low water mark. It extends from Cromer to near Kessingland, and consists of the stumps of numerous trees standing erect, with their roots attached to them, and penetrating in all directions into the loam or ancient vegetable soil on which they grew. They mark the site of a forest which existed there for a long time, since, besides the erect trunks of trees, some of them two and three feet in diameter, there is a vast accumulation of vegetable matter in the immediately overlying clays. Thirty years ago, when I first examined this bed, I saw many trees, with their roots in the old soil, laid open at the base of the cliff near Happisburgh ; and long before my visit, other observers, and among them the late Mr. J. C. Taylor, had noticed the buried forest. Of late years it has been repeatedly seen at many points by Mr. Grunn, and, after the great storms of the autumn of 1861, by Mr. King. In order to expose the stumps to view, a vast body of sand and shingle must be cleared away by the force of the waves. As the sea is always gaining on the land, new sets of trees are brought to light from time to time, so that the breadth as well as length of the area of ancient forest land seems to have been considerable. Next above No. 2, we find a series of sands and clays with lignite (No. 3'), sometimes ten feet thick, and containing alternations of fluviatile and marine strata, implying that the old forest land, which may at first have been considerably elevated above the level of the sea, had sunk down so as to be occasionally overflowed by a river, and at other times by the salt waters of an estuary. There were probably several oscillations of level which assisted in bringing about these changes, during which trees were often uprooted and laid prostrate, giving rise to layers of lignite. Occasionally marshes were formed and peaty matter accumu- CHAP. xii. FOREST BED OF NORFOLK CLIFFS. 215 lated, after which salt water again predominated, so that species of Mytilus, My a, Leda, and other marine genera, lived in the same area where the Unio, Cyclas, and Paludina had nourished for a time. That the marine shells lived and died on the spot, an$ were not thrown up by the waves during a storm, is proved, as Mr. King has remarked, by the fact that at West Eunton, NW. of Cromer, the My a truncata and Leda myalis are found with both valves united and erect in the loam, all. with their posterior or siphun- cular extremities uppermost. This attitude affords as good evidence to the conchologist that those mollusca lived and died on the spot as the upright position of the trees proves to the botanist that there was a forest over the chalk east of Cromer. Between the stumps of the buried forest, and in the lignite above them, are many well-preserved cones of the Scotch and spruce firs, Pinus sylvestris, and Pinus Abies. The specific names of these fossils were determined for me in 1840, by a botanist of no less authority than the late Kobert Brown ; and Professor Heer has lately examined a large collection from the same stratum, and recognised among the cones of the spruce some which had only the central part or axis remain ing, the rest having been bitten off, precisely in the same manner as when in our woods the squirrel has been feeding on the seeds. There is also in the forest-bed a great quan tity of resin in lumps, resembling that gathered for use, according to Professor Heer, in Switzerland, from beneath spruce firs. The following is a list of some of the plants which were collected by the Rev, S. Gr. King, in 1861, from the forest bed, and named by Professor Heer : Pinus sylvestris, Scotch fir . . Mundesley. Pinus Abies , spruce fir ... 216 FOSSIL PLANTS AND MAMMALIA CHAP. xii. Taxus baccata, yew . . . Mundesley. Prunus spinosa, common sloe . Menyanthes trifoliata, buckbean . Nymphcea alba, white water-lily . Nuphar luteum, yellow water-lily . Ceratophyllum demorsum, hornwort . Potamogeton, pondweed ... Alnus, alder . - . . . Bacton. Quercus, oak .... The insects, so far as they are known, including several species of Donacea, are, like the plants and freshwater shells, of living species. It may be remarked, however, that the Scotch fir has been confined in historical times to the northern parts of the British isles, and the spruce fir is nowhere in digenous in Great Britain. The other plants are such as might now be found in Norfolk, and many of them indicate fenny or marshy ground. When we consider the familiar aspect of the flora, the accompanying mammalia are certainly most extraordinary. There are no less than two elephants, a rhinoceros and hippopotamus, a large extinct beaver, and several large estuarian and marine mammalia, such as the walrus, the narwhal, and the whale. The following is a list of some of the species of which the bones have been collected by Messrs. Gunn and King, and named by Dr. Falconer and other geologists : Mammalia of the Forest and Lignite Beds below the Glacial Drift of the Norfolk Cliffs. Elephas meridionalis. Elephas primigenius var. Elephas antiquus. Eh >-nocero8 etruscus. CHAP. xil. OF NORFOLK CLIFFS. 217 Hippopotamus (major ?). Sue. Equus (fossilis ?). Bos. Cervus Capreolus ? and other species of Cervus. Arvicola amphibia. Castor trogontherium. Castor europceus. Narwhal, walrus, and large whale, or Balcenoptera ? Mr. Gunn informs me that two large whales were found in the fluvio-marine beds at Bacton, and that the vertebraB of one of them, shown to Professor Owen, were said by him to imply that the animal was sixty feet long. A narwhal's tusk was discovered by Mr. King near Cromer, and the remains of a walrus. No less than three species of elephant, as deter mined by Dr. Falconer, have been obtained from the strata 3 and 3', of which, according to Mr. King, E. meridionalis is the most common, the mammoth next in abundance, and the third, E. antiquus, comparatively rare. The freshwater shells accompanying the fossil quadrupeds, above enumerated, are such as now inhabit rivers and ponds in England ; but among them, as at Runton, between the ( forest bed ' and the glacial deposits, a remarkable variety of the Cydas amnica occurs, fig. 28, p. 218, identical with that which accompanies the Elephas antiquus at Ilford and Grays in the valley of the Thames. All the freshwater shells of the beds intervening between the forest-bed No. 3,' and the glacial formation 4, fig. 27, are of recent species. As to the small number of marine shells occurring in the same fluvio-marine series, I have seen none which belonged to extinct species, although one or two have been cited by authors. I am in doubt, therefore, whether to class the forest bed and overlying strata as post- 218 GLACIAL DEPOSITS CHAP. xn. pliocene, or to consider them as beds of passage between the newer pliocene and post-pliocene periods. The fluvio-marine Fig. 28 Cyclas (Pisidium) amnica var. ? The two middle figures are of the natural size. series usually terminates upwards in finely laminated sands and clays without fossils, on which reposes the boulder clay. This formation, No. 4, is of very varying thickness. Its glacial character is shown, not only by the absence of stratifi cation, and the great size and angularity of some of the included blocks of distant origin, but also by the polished and scratched surfaces of such of them as are hard enough to retain any markings. Near Cromer, blocks of granite from six to eight feet in diameter have been met with, and smaller ones of sienite, porphyry, and trap, besides the wreck of the London clay, chalk, oolite, and lias, mixed with more ancient fossiliferous rocks. Erratics of Scandinavian origin occur chiefly in the lower portions of the till. I came to the conclusion in 1834, that they had really come from Norway and Sweden, after having in that year traced the course of a continuous stream of such blocks from those countries to Denmark, and across the Elbe, through Westphalia, to the borders of Holland. It is not surprising that they should then reappear on our eastern coast between the Tweed and the Thames, regions not half so remote from parts of Norway as are many Russian erratics from the sources whence they came. According to the observations of the Rev. J. Grunn and the CHAP. xii. OF NORFOLK CLIFFS. 219 late Mr. Trimmer, the glacial drift in the cliffs at Lowestoff consists of two divisions, the lower of which abounds in the Scandinavian blocks, supposed to have come from the north-east ; while the upper, probably brought by a current from the north-west, contains chiefly fragments of oolitic rocks, more rolled than those of the lower deposit. The united thickness of the two divisions without reckoning some interposed laminated beds, is eighty feet, but it probably ex ceeds one hundred feet near Happisburgh.* Although these subdivisions of the drift may be only of local importance, they help to show the changes of currents and other conditions, and the great lapse of time which the accumulation of so varied a series of deposits must have required. The lowest part of the glacial till, resting on the laminated clays before mentioned, is very even and regular, while its upper surface is remarkable for the unevenness of its outline, owing partly, in all likelihood, to denudation, but still more to other causes presently to be discussed. The overlying strata of sand and gravel, No. 5, p. 213, often display a most singular derangement in their stratification, which in many places seems to have a very intimate re lation to the irregularities of outline in the subjacent till. There are some cases, however, -where the upper strata are much bent, while the lower beds of the same series have con tinued horizontal. Thus the annexed section (fig. 29) represents a cliff about fifty feet high, at the bottom of which is till, or unstratified clay, containing boulders, having an even horizontal surface, on which repose conformably beds of laminated clay and sand about five feet thick, which, in their turn, are succeeded by vertical, bent, and contorted layers of sand and loam twenty feet thick, the whole being covered by flint gravel. The curves of the variously coloured beds of * Quarterly Geological Journal, vol. vii. p. 21. 220 GLACIAL DEPOSITS CHAP. XII. loose sand, loam, and pebbles, are so complicated that not only may we sometimes find portions of them which maintain Fig. 29 Gravel Till Cliff 50 feet high between Bacton Gap and Mundesley. their verticality to a height of ten or fifteen feet, but they have also been folded upon themselves in such a manner that continuous layers might be thrice pierced in one perpen dicular boring. At some points there is an apparent folding of the beds round a central nucleus, as at a, fig. 30, where the strata seem Fig. 31 Fig. 30 Folding of the strata between East and West Kunton. Section of concentric beds west of Cromer. 1 Blue clay. 3 Yellow sand. 2 White sand. 4 Striped loam and clay. 5 Laminated blue clay. bent round a small mass of chalk, or, as in fig. 31, where the blue clay, No. 1, is in the centre ; and where the other strata, 2, 3, 4, 5, are coiled round it ; the entire mass being twenty CHAP. XII. OF NORFOLK CLIFFS. 221 feet in perpendicular height. This appearance of concentric arrangement around a nucleus is, nevertheless, delusive, being produced by the intersection of beds bent into a convex shape ; and that which seems the nucleus being, in fact, the innermost bed of the series, which has become partially visible by the removal of the protuberant portions of the outer layers. To the north of Cromer are other fine illustrations of con torted drift reposing on a floor of chalk horizontally stratified and having a level surface. These phenomena, in themselves sufficiently difficult of explanation, are rendered still more anomalous by the occasional inclosure in the drift of huge fragments of chalk many yards in diameter. One striking instance occurs west of Sherringham, where an enormous pinnacle of chalk, between seventy and eighty feet in height, is flanked on both sides by vertical layers of loam, clay, and gravel (fig. 32). Fig. 32 Included pinnacle of chalk at Old Hythe point, west of Sherringham. d Chalk with regular layers of chalk flints. c Layer called ' the pan,' of chalk, flints, and marine shells of recent species, cemented by oxide of iron. This chalky fragment is only one of many detached masses which have been included in the drift, and forced along with 222 CONTORTED DRIFT. CHAP. xn. it into their present position. The level surface of the chalk in situ (d) may be traced for miles along the coast, where it has escaped the violent movements to which the incumbent drift has been exposed.* We are called upon, then, to explain how any force can have been exerted against the upper masses, so as to produce movements in which the subjacent strata have not partici pated. It may be answered that, if we conceive the till and its boulders to have been drifted to their present place by ice, the lateral pressure may have been supplied by the strand ing of ice-islands. We learn, from the observations of Messrs. Dease and Simpson in the polar regions, that such islands, when they run aground, push before them large mounds of shingle and sand. It is therefore probable that they often cause great alterations in the arrangement of pliant and incoherent strata forming the upper part of shoals or submerged banks, the inferior portions of the same remaining unmoved. Or many of the complicated curvatures of these layers of loose sand and gravel may have been due to another cause, the melting on the spot of icebergs and coast ice in which successive deposits of pebbles, sand, ice, snow, and mud, together with huge masses of rock fallen from cliffs, may have become interstratified. Ice-islands so constituted often cap size when afloat, and gravel once horizontal may have assumed, before the associated ice was melted, an inclined or vertical position. The packing of ice forced up on a coast may lead to a similar derangement in a frozen conglomerate of sand or shingle, and, as Mr. Trimmer has suggested, f alternate layers of earthy matter may have sunk down slowly during the liquefaction of the intercalated ice so as to assume the most fantastic and anomalous positions, while the strata below, * For a full account of the drift of 104, May, 1840. East Norfolk, see a paper by the f Quarterly Journal, Geological author, Philosophical Magazine, No. Society, vol. vii. pp. 22, 30. CHAP. xii. MUNDESLEY FRESHWATER FORMATION. 223 and those afterwards thrown down above, may be perfectly horizontal (see above). In most cases where the principal contortions of the layers of gravel and sand have a decided correspondence with deep indentations in the underlying till, the hypothesis of the melting of Jarge lumps and masses of ice once mixed up with the till affords the most natural explanation of the phenomena. The quantity of ice now seen in the cliffs near Behring's Straits, in which the remains of fossil elephants are common, and the huge fragments of solid ice which Meyendorf dis covered in Siberia, after piercing through a considerable thickness of incumbent soil, free from ice, is in favour of such an hypothesis, the partial failure of support necessarily giving rise to foldings in the overlying and previously hori zontal layers, as in the case of creeps in coal mines.* In the diagram of the cliffs at p. 213, the bent and con torted beds No. 5, last alluded to, are represented as covered by undisturbed beds of gravel and sand, No. 6. These are usually destitute of organic remains ; but at some points marine shells of recent species are said to have been found in them. They afford evidence at many points of repeated denudation and redeposition, and may be the monuments of a long series of ages. Mundesley Post-glacial Freshwater Formation. In the range of cliffs above described at Mundesley, about two miles south-east of Cromer, a fine example is seen of a freshwater formation, newer than all those already mentioned, a deposit which has filled up a depression hollowed out of all the older beds 3, 4, and 5, of the section, p. 213. When I examined this line of coast in 1839, the section alluded to was not so clearly laid open to view as it has * See Manual of Geology, by the author, p. 51. 224 MUNDESLEY FRESHWATER FORMATION. CHAP. XII. been of late years, and finding at that period not a few of the fossils in the lignite beds, No. 3', above the forest bed, iden tical in species with those from the post-glacial deposits, B c, I supposed the whole to have been of contemporaneous 03 1 Section of the newer freshwater formation in the cliffs at Mimdesley, two miles SE. of Cromer, drawn up by the Eev. S. W. King. Height of cliff where lowest, 35 feet above high water. Older Series. 1 Fundamental chalk, below the beach line. 3 Forest bed, with elephant, rhinoceros, stag, &c., and with tree roots and stumps, also below the beach line. 3' Finely laminated sands and clays, with thin layer of lignite, and shells of Cyclas, and Valvata, and with Mytilus in some beds. 4 Glacial boulder till. 5 Contorted drift. 6 Gravel overlying contorted drift. N.B. No. 2 of the section, fig. 27, at p. 213, is wanting here. Newer Freshwater Beds. A Coarse river gravel, in layers inclined against the till and laminated sands. B Black peaty deposit, with shells of Anodon, Valvata, Cyclas, Suc- cinea, Limnea, Paludina, &c., seeds of Ceratophyllum demersum, Nuphar lutea, scales and bones of pike, perch, salmon, &c., elytra of Donacia, Copris, Harpalus, and other beetles. c Yellow sands. D Drift gravel origin, and so described them in my paper on the Norfolk cliffs.* Mr. Gunn was the first to perceive this mistake, which he explained to me on the spot when I revisited Mundesley in the autumn of 1859, in company with Dr. Hooker and * Philosophical Magazine, vol. xvi. May 1840, p. 345. CHAP. xii. MUNDESLEY FRESHWATER FORMATION. 225 Mr. King. The last-named geologist has had the kindness to draw up for me the annexed diagram of the various beds which he has recently studied in detail.* The formations 3, 4, and 5, already described, p. 213, were evidently once continuous, for they may be followed for. miles NW. and SE. without a break, and always in the same order. A valley or river channel was cut through them, pro bably during the gradual upheaval of the country, and the hollow became afterwards the receptacle of the comparatively modern freshwater beds, A, B, c, and D. They may well re present a silted up river-channel, which remained for a time in the state of a lake or mere, and in which the black peaty mass, B, accumulated by a very slow growth over the gravel of the river-bed A. . In B, we find remains of some of the same plants which were enumerated as common in the ancient lignite in 3', such as the yellow water-lily and pond- wort, together with some fresh water shells which occur in the same fluvio-marine series 3'. Fig. 34 Paludina marginata Michaud. (P. minuta Strickland.) Hydrobia marginata.^ The middle figure is of the natural size. The only shell which I found not referable to a British spe cies is the minute paludina, fig. 34, already alluded to, p. 1 64. * Mr. Prestwich has given a correct one, as in Paludina), and therefore to account of this section in a paper read be referable to the Hydrobia, a sub- to the British Association, Oxford, genus of Eissoa. But this species is 1860. See Geologist's Magazine, always associated with freshwater vol. iv. 1861. shells, while the Kissose frequent f This shell is said to have a sub- marine and brackish waters. spiral operculum (not a concentric 226 COMPAEISON OF MUNDESLEY CHAP. xii. When I showed the scales and teeth of the pike, perch, roach, and salmon, which I obtained from this formation, to Mr. Agassiz, he thought they varied so much from their nearest living representatives that they might rank as distinct species ; but Mr. Yarrell doubted the propriety of so distin guishing them. The insects, like the shells and plants, are identical, so far as they are known, with living British species. No progress has yet been made at Mundesley in dis covering the contemporary mammalia. By referring to the description and section of the freshwater deposit at p. 159, the reader will at once perceive the striking analogy of the Mundesley and Hoxne deposits, the latter so productive of flint implements of the Amiens type. Both of them, like the Bedford gravel with flint tools and the bones of extinct mammalia (noticed at p. 164), are postglacial. It will also be seen that a long series of events, accompanied by changes in physical geography, intervened between the ' forest bed,' No. 3, fig. 27, p. 213, when the Elephas meridionalis flourished, and the period of the Mundesley fluviatile beds A, B, c ; just as in France I have shown, p. 199, that the same E. meridionalis belonged to a system of drainage different from and anterior to that with which the flint im plements of the old alluvium of the Somme and the Seine were connected. Before the growth of the ancient forest, No. 3, fig. 33, the Mastodon arvernensis, a large proboscidian, characteristic of the Norwich crag, appears to have died out, or to have become scarce, as no remains of it have yet been found in the Norfolk cliffs. There was, no doubt, time for other modifications in the mammalian fauna between the era of the marine beds, No. 2, p. 213 (the shells of which imply permanent sub mergence beneath the sea), and the accumulation of the uppermost of the fluvio-marine, and lignite beds, No. 3', which overlie both Nos. 3 and 2, or the buried forest and the crag. CHAP. xir. AND HOXNE DEPOSITS. 227 In the interval we must suppose repeated oscillations of level, during which land covered with trees, an estuary with its freshwater shells, and the sea with its Mya truncata and other mollusca still retaining their erect position, gained by turns the ascendency. These changes were accompanied by some denudation followed by a grand submergence of several hundred feet, probably brought about slowly, and when floating ice aided in transporting erratic blocks from great distances. The glacial till, No. 4, then originated, and the gravel and sands, No. 5, were afterwards superimposed on the boulder clay, first in horizontal beds, which became sub sequently contorted. These were covered in their turn by other layers of gravel and sand, No. 6, pp. 213 and 224, the downward movement still continuing. The entire thickness of the beds above the chalk at some points near the coast, and the height at which they now are raised, are such as to show that the subsidence of the country after the growth of the forest bed, exceeded four hundred feet. The re-elevation must have amounted to nearly as many feet, as the site of the ancient forest, originally subaerial, has been brought up again to within a few feet of high-water mark. Lastly, after all these events, and probably during the final process of emergence, the valley was scooped out in which the newer freshwater strata of Mundesley, fig. 33, p. 224, were gradually deposited. Throughout the whole of this succession of geographical changes, the flora and invertebrate fauna of Europe appear to have undergone no important revolution in their specific characters. The plants of the forest bed belonged already to what has been called the Germanic flora. The mollusca, the insects, and even some of the mammalia, such as the European beaver and roebuck, were the same as those now coexisting with man. Yet the oldest memorials of our species at present discovered in Great Britain are post-glacial, or posterior in date Q 2 228 AGE OF MAN PREGLACIAL. CHAP. xn. to the boulder clay, No. 4, pp. 213 and 224. The position of the Hoxne flint implements corresponds with that of the Mundesley beds, from A to D, p. 224, and the most likely stratum in which to find hereafter flint tools is no doubt the gravel A of that section which has all the appearance of an old river-bed. No flint tools have yet been observed there, but had the old alluvium of Amiens or Abbeville occurred in the Norfolk cliffs instead of the Valley of the Somme, and had we de pended on the waves of the sea instead of the labour of many hundred workmen continued for twenty years, for exposing the flint implements to view, we might have remained ignorant to this day of the fossil relics brought to light by M. Boucher de Perthes, and those who have followed up his researches. Neither need we despair of one day meeting with the signs of man's existence in the forest bed No. 3, or in the overlying strata 3', on the ground of any uncongeniality in the climate or incongruity in the state of the animate creation with the well-being of our species. For the present we must be con tent to wait and consider that we have made no investigations which entitle us to wonder that the bones or stone weapons of the era of the Elephas meridionalis have failed to come to light. If any such lie hid in those strata, and should here after be revealed to us, they would carry back the antiquity of man to a distance of time probably more than twice as great as that which separates our era from that of the most ancient of the tool-bearing gravels yet discovered in Picardy, or elsewhere. But even then the reader will perceive that the age of man, though preglacial, would be so modern in the great geological calendar, as given at p. 7, that he would scarcely date so far back as the commencement of the post- pliocene period. CHAP. xin. THE GLACIAL PERIOD. 229 CHAPTER XIII. CHRONOLOGICAL RELATIONS OF THE GLACIAL PERIOD AND THE CHRONOLOGICAL RELATIONS OF THE CLOSE OF THE GLACIAL PERIOD AND THE EARLIEST GEOLOGICAL SIGNS OF THE APPEARANCE OF MAN EFFECTS OF GLACIERS AND ICEBERGS IN POLISHING AND SCORING ROCKS SCANDINAVIA ONCE ENCRUSTED WITH ICE LIKE GREENLAND OUTWARD MOVEMENT OF CONTINENTAL ICE IN GREENLAND MELD CLIMATE OF GREENLAND IN THE MIOCENE PERIOD ERRATICS OF RECENT PERIOD IN SWEDEN GLACIAL STATE OF SWEDEN IN THE POST- PLIOCENE PERIOD SCOTLAND FORMERLY ENCRUSTED WITH ICE ITS SUBSEQUENT SUBMERGENCE AND RE-ELEVATION LATEST CHANGES PRODUCED BY GLACIERS IN SCOTLAND REMAINS OF THE MAMMOTH AND REINDEER IN SCOTCH BOULDER CLAY PARALLEL ROADS OF GLEN EOY FORMED IN GLACIER LAKES COMPARATIVELY MODERN DATE OF THESE SHELVES. THE chronological relations of the human and glacial pe riods were frequently alluded to in the last chapter, and the sections obtained near Bedford (p. 164), and at Hoxne, in Suffolk (p. 168), and a general view of the Norfolk cliffs, have taught us that the earliest signs of man's appearance in the British Isles, hitherto detected, are of post-glacial date, in the sense of being posterior to the grand submergence of England beneath the waters of the glacial sea. But long after that period, when nearly the whole of England North of the Thames and Bristol Channel lay submerged for ages, the bottom of the sea, loaded with mud and stones melted out of floating ice, was upheaved, and glaciers filled for a second time the valleys of many mountainous regions. We may now therefore inquire whether the peopling of Europe by the human race and by the mammoth and other mammalia 230 SUPERFICIAL TRACES OF THE EFFECTS CHAP. XIII. now extinct, was brought about during this concluding phase of the glacial epoch. Although it may be impossible in the present state of our knowledge to come to a positive conclusion on this head, I know of no inquiry better fitted to clear up our views respec ting the geological state of the northern hemisphere at the time when the fabricators of the flint implements of the Amiens type flourished. I shall therefore now proceed to consider the chronological relations of that ancient people with the final retreat of the glaciers from the mountains of Scandinavia, Scotland, Wales, and Switzerland. Superficial Markings and Deposits left by Glaciers and Icebergs. In order fully to discuss this question, I must begin by re ferring to some of the newest theoretical opinions entertained on the glacial question. When treating of this subject in the 'Principles of Geology,' ch. xv., and in the ' Manual (or Ele ments) of Greology,' ch. xi., I have stated that the whole mass of the ice in a glacier is in constant motion, and that the blocks of stone detached from boundary precipices, and the mud and sand swept down by avalanches of snow, or by rain from the surrounding heights, are lodged upon the surface and slowly borne along in lengthened mounds, called in Switzerland moraines. These accumulations of rocky frag ments and detrital matter are left at the termination of the glacier, where it melts in a confused heap called the ' terminal moraine,' which is unstratified, because all the blocks, large and small, as well as the sand and the finest mud, are carried to equal distances and quietly deposited in a confused mass without being subjected to the sorting power of running water, which would convey the finer materials farther than the coarser ones, and would produce, as the strength of the CHAP. Xiir. PRODUCED BY GLACIERS AND ICEBERGS. 231 current varied from time to time in the same place, a stratified arrangement. In those regions where glaciers reach the sea, and where large masses of ice break off and float away, moraines, such as I have just alluded to, may be transported to indefinite distances, and may be deposited on the bottom of the sea wherever the ice happens to melt. If the liquefaction takes place when the berg has run aground and is stationary, and if there be no current, the heap of angular and rounded stones, mixed with sand and mud, may fall to the bottom in an un- stratified form called 'till ' in Scotland, and which has been shown in the last chapter to abound in the Norfolk cliffs ; but should the action of a current intervene at certain points or at certain seasons, then the materials will be sorted as they fall, and arranged in layers according to their relative weight and size. Hence there will be passages from till to stratified clay, gravel, and sand, and intercalations of one in the other. Many of the blocks of stone with which the surfaces of glaciers are loaded, falling occasionally through fissures in the ice, get fixed and frozen into the bottom of the moving mass, and are pushed along under it. In this position, being subjected to great pressure, they scoop out long rectilinear furrows or grooves parallel to each other on the subjacent solid rock. Smaller scratches and striaB are made on the polished surface by crystals or projecting edges of the hardest minerals, just as a diamond cuts glass. In all countries the fundamental rock on which the boulder formation reposes, if it consists of granite, gneiss, marble, or other hard stone capable of permanently retaining any super ficial markings which may have been imprinted upon it, is smoothed or polished, and exhibits parallel stria3 and furrows having a determinate direction. This prevailing direction, both in Europe and North America, is evidently connected with the course taken by the erratic blocks in the same dis- 232 SCANDINAVIA ONCE ENCRUSTED CHAP. xiu. trict, and is very commonly from north to south, or if it be twenty or thirty or more degrees to the east or west of north, still always corresponds to the direction in which the large angular and rounded stones have travelled. These stones themselves also are often furrowed and scratched on more than one side, like those already spoken of as occurring in the glacial drift of Bedford (p. 165), and in that of Norfolk (pp. 213 and 218). When we contemplate the area which is now exposed to the abrading action of ice, or which is the receptacle of mo raine matter thrown down from melting glaciers or bergs, we at once perceive that the submarine area is the most exten sive of the two. The number of large icebergs which float annually to great distances in the northern and southern hemisphere is extremely great, and the quantity of stone and mud which they carry about with them enormous. Some floating islands of ice have been met with from two to five miles in length, and from one hundred to two hundred and twenty-five feet in height above water, the submerged por tion, according to the weight of ice relatively to sea water, being from six to eight times more considerable than the part which is visible. Such masses, when they run aground on the bottom of the sea, must exert a prodigious mechanical power, and may polish and groove the subjacent rocks after the manner of glaciers on the land. Hence there will often be no small difficulty in distinguishing between the effects of the submarine and supramarine agency of ice. Scandinavia once covered with Ice, and a Centre of Dispersion of Erratics. In the north of Europe, along the borders of the Baltic, where the boulder formation is continuous for hundreds of miles east and west, it has been long known that the erratic CHAP. xm. WITH ICE LIKE GREENLAND. 233 blocks, often of very large size, are of northern origin. Some of them have come from Norway and Sweden, others from Finland, and their present distribution implies that they were carried southwards, for a part at least of their way, by floating ice, at a time when much of the area over which they are scattered was under water. But it appears from the obser vations of Boetlingk, in 1840, and those of more recent in quirers, that while many blocks have travelled to the south, others have been carried northwards, or to the shores of the Polar Sea, and others north-eastward, or to those of the White Sea. In fact, they have wandered towards all points of the compass, from the mountains of Scandinavia as a centre, and the rectilinear furrows imprinted by them on the polished surfaces of the mountains where the rocks are hard enough to retain such markings, radiate in all directions, or point out wards from the highest land, in a manner corresponding to the course of the erratics above mentioned. Before the glacial theory was adopted, the Swedish and Norwegian geologists speculated on a great flood, or the sudden rush of an enormous body of water charged with mud and stones, descending from the central heights or watershed into the adjoining lower lands. The erratic blocks were sup posed in their downward passage to have smoothed and striated the rock surfaces over which they were forced along. It would be a waste of time, in the present state of science, to controvert this hypothesis, as it is now admitted that even if the rush of a diluvial current, invented for the occasion and wholly without analogy in the known course of nature, be granted, it would be inadequate to explain the uniformity, parallelism, persistency, and rectilinearity of the so-called glacial furrows. It is moreover ascertained that heavy masses of rock, not fixed in ice, and moving as freely as they do when simply swept along by a muddy current, do not give rise to such scratches and furrows. 234 VIEWS OF M. KJERULE. CHAP. xm. M. Kjerulf, of Christiania, in a paper lately communicated to the Geological Society of Berlin,* has objected, and perhaps with reason, to what he considers the undue extent to which I have, in some of my writings, supposed the mountains of northern Europe to have been submerged during the glacial period. He remarks that the signs of glacial action on the Scandinavian mountains ascend as high as 6,000 feet, whereas fossil marine shells of the same period never reach elevations exceeding 600 feet. The land he says may have been much higher than it now is, but it has evidently not been much lower since the commencement of the glacial period, or marine shells would be traceable to more elevated points. In regard to the absence of marine shells, I shall point out in the se quel how small is the dependence we can place on this kind of negative evidence, if we desire to test by it the extent to which the land has been submerged. I cannot therefore con sent to limit the probable depression and re-elevation of Scandinavia to 600 feet. But that the larger part of the glaciation of that country has been supramarine, I am willing to concede. In support of this view M. Kjerulf observes that the direction of the furrows and striae, produced by glacial abrasion, neither conforms to a general movement of floating ice from the Polar regions, nor to the shape of the existing valleys, as it would do if it had been caused by independent glaciers generated in the higher valleys after the land had acquired its actual shape. Their general arrangement and apparent irregularities are, he contends, much more in accor dance with the hypothesis of there having been at one time a universal covering of ice over the whole of Norway and Sweden, like that now existing in Greenland, which, being annually recruited by fresh falls of snow, was continually pressing outwards and downwards to the coast and lower regions, after crossing many of the lower ridges, and having * Zeitschrift der G-eologischen G-esellschaft, Berlin, 1860. CHAP. xni. CONTINENTAL ICE OF GREENLAND. 235 no relation to the minor depressions, which were all choked up with ice and reduced to one uniform level. Continental Ice of Greenland. In support of this view, he appeals to the admirable de scription of the continental ice of Greenland, lately published by Dr. H. Eink, of Copenhagen,* who resided three or four years in the Danish settlements, in Baffin's Bay, on the west coast of Greenland, between latitudes 69 and 73 N. ' In that country, the land,' says Dr. Eink, ' may be divided into two regions, the " inland " and the " outskirts." The " inland," which is 800 miles from west to east, and of much greater length from north to south, is a vast unknown continent, buried under one continuous and colossal mass of permanent ice, which is always moving seaward, but a small proportion only of it in an easterly direction, since nearly the whole de scends towards Baffin's Bay.' On reaching the heads of the fiords which intersect the coast, a perpendicular wall of ice, 2,000 feet thick, is seen, beyond which the ice of the interior rises by a succession of steps, twenty-five of which were counted by Eink (but of which there are known to be still more), all of them leading up to as many icy platforms, the ridges and valleys being levelled up to one uniform plane, and concealed by these tabular masses of ice. Although all the ice is moving seaward, the greatest quan tity is discharged at the heads of certain large friths, usually about four miles wide, which, if the climate were milder, would be the outlet of as many great rivers. Through these the ice is now protruded in huge blocks, several miles wide, and from 1,000 to 1,500 feet in height or thickness. When these masses reach the friths, they do not melt or break up into fragments, but continue their course in a solid form * Journal of Royal Geographical Society, vol. xxiii. p. 145, 1853. 236 HINK ON ICE OF GREENLAND. CHAP, xiir, under the salt water, grating along the rocky bottom, which they must polish and score at depths of hundreds and even of more than a thousand feet. At length, when there is water enough to float them, huge portions, having broken off, fill Baffin's Bay with icebergs of a size exceeding any which could be produced by ordinary land glaciers. Stones, sand, and mud are sometimes included in these bergs which float down Baffin's Bay. At some points, where the ice of the interior of Greenland reaches the coast, Dr. Eink saw mighty springs of clayey water issuing from under the edge of the ice even in winter, showing the grinding action of the glacial mass mixed with sand, on the subjacent surface of the rocks. The ' outskirts,' where the Danish colonies are stationed, consist of numerous islands, of which Disco island is the* largest, in lat. 70 N., and of many peninsulas, with fiords from fifty to a hundred miles long, running into the land, and through which the ice above alluded to passes on its way to the bay. This area is 30,000 square miles in extent, and contains in it some mountains 4,000 feet to 5,000 feet high. The perpetual snow usually begins at the height of 2,000 feet, below which level the land is for the most part free from snow between June and August, and supports a vegetation of several hundred species of flowering plants, which ripen their seeds before the winter. There are even some places where phenogamous plants have been found at an elevation of 4,500 feet ; a fact which, when we reflect on the immediate vicinity of so large and lofty a region of conti nental ice in the same latitude, well deserves the attention of the geologist, who should also bear in mind, that while the Danes are settled to the west in the 'outskirts,* there exists, due east of the most southern portion of this ice-covered con tinent, at the distance of about 1,200 miles, the home of the Laplanders with their reindeer, bears, wolves, seals, walruses, and cetacea. If, therefore, there are geological grounds for CHAP. XIII. FORMER MILD CLIMATE OF GREENLAND. 237 suspecting that Scandinavia or Scotland or Wales were ever in the same glacial condition as Greenland now is, we must not imagine that the contemporaneous fauna and flora were everywhere poor and stunted, or that they may not, especially at the distance of a few hundred miles in a southward di rection, have been very luxuriant. Another series of observations made by Captain Graah, during a survey of Greenland between 1823 and 1829, and by Dr. Pingel in 1830-32, adds not a little to the geological interest of the ( outskirts,' in their bearing on glacial pheno mena of ancient date. Those Danish investigators, with one of whom, Dr. Pingel, I conversed at Copenhagen in 1834, ascertained that the whole coast from lat. 60 to about 70 north has been subsiding for the last four centuries, so that some ancient piles driven into the beach to support the boats of the settlers have been gradually submerged, and wooden build ings have had to be repeatedly shifted farther inland.* In Norway and Sweden, instead of such a subsiding move ment, the land is slowly rising ; but we have only to suppose that formerly, when it was covered like Greenland with conti nental ice, it sank at the rate of several feet in a century, and we shall be able to explain why marine deposits are found above the level of the sea, and why these generally overlie polished and striated surfaces of rock. We know that Greenland was not always covered with snow and ice, for when we examine the tertiary strata of Disco Island (of the upper miocene period) we discover there a multitude of fossil plants, which demonstrate that, like many other parts of the arctic regions, it formerly enjoyed a mild and genial climate. Among the fossils brought from that island, lat. 70 K, Professor Heer has recognised Sequoia Langsdorfii, a coniferous species which flourished throughout a great part of Europe in the miocene period, * Principles of Geology, cli. xxx. 238 MIOCENE FLORA OF ICELAND. CHAP. xra. and is very closely allied to the living Sequoia sempervirens of California. The same plant has been found fossil by Sir John Eichardson within the arctic circle, far to the west on the Mackenzie Eiver, near the entrance of Bear Eiver, also by some Danish naturalists in Iceland to the east. The Ice landic surturbrand, or lignite, of this age has also yielded a rich harvest of plants, more than thirty-one of them, accord ing to Steenstrup and Heer, in a good state of preservation, and no less than fifteen specifically identical with miocene plants of Europe. Thirteen of the number are arborescent; and amongst others is a tulip-tree (Liriodendron), with its fruit and characteristic leaves, a plane (Platanus), a walnut, and a vine, affording unmistakeable evidence of a climate in the parallel of the arctic circle which precludes the supposition of glaciers then existing in the neighbourhood, still less any general crust of continental ice, like that of Greenland.* As the older pliocene flora of the tertiary strata of Italy, like the shells of the coralline crag, before adverted to, p. 210, indicate a temperature milder than that now prevail ing in Europe, though not so warm as that of the upper miocene period, it is probable that the accumulation of snow and glaciers on the mountains and valleys of Greenland did not begin till after the commencement of the pliocene period, and may not have reached its maximum until the close of that period. Norway and Sweden appear to have passed through all the successive phases of glaciation which Greenland has experi enced, and others which that country will one day undergo, if the climate which it formerly enjoyed should ever be restored to it. There must have been first a period of separate glaciers in Scandinavia, then a Greenlandic state of continental ice, and thirdly, when that diminished, a second period of enormous separate glaciers filling many a valley now wooded with fir and * Heer, Eeclierclies sur la Vegetation du Pays tertiaire, &c., 1861, p. 178. CHAP. xm. ERRATICS OF RECENT PERIOD IN SWEDEN. 239 birch. Lastly, under the influence of the Grulf Stream, and various changes in the height and extent of land in the arctic circle, a melting of nearly all the permanent ice between lati tudes 60 and 70 north, corresponding to the parallels of the continental ice of Greenland, has occurred, so that we have now to go farther north than lat. 70 before we encounter any glacier coming down to the sea coast. Among other signs of the last retreat of the extinct glaciers, Kjerulf and other authors describe large transverse moraines left in many of the Norwegian and Swedish glens. Chronological Relations of the Human and Glacial Periods in Sweden. We may now consider whether any, and what part, of these changes in Scandinavia may have been witnessed by man. In Sweden, in the immediate neighbourhood of Upsala, I observed, in 1834, a ridge of stratified sand and gravel, in the midst of which occurs a layer of marl, evidently formed originally at the bottom of the Baltic, by the slow growth of the mussel, cockle, and other marine shells of living species intermixed with some proper to fresh water. The marine shells are all of dwarfish size, like those now inhabiting the brackish waters of the Baltic ; and the marl, in which myriads of them are imbedded, is now raised more than a hundred feet above the level of the Grulf of Bothnia. Upon the top of this ridge (one of those called osars in Sweden) repose several huge erratics, consisting of gneiss for the most part unrounded, from nine to sixteen feet in diameter, and which must have been brought into their present position since the time when the neighbouring gulf was already characterised by its peculiar fauna. Here, therefore, we have proof that the transport of erratics continued to take place, not merely when the sea was inhabited by the existing testacea, but 240 UPSALA ERRATICS. CHAP. xm. when the north of Europe had already assumed that remark able feature of its physical geography, which separates the Baltic from the North Sea, and causes the Grulf of Bothnia to have only one-fourth of the saltness belonging to the ocean. I cannot doubt that these large erratics of Upsala were brought into their present position during the recent period, not only because of their moderate elevation above the sea- level in a country where the land is now rising every century, but because I observed signs of a great oscillation of level which had taken place at Sodertelje, south of Stockholm (about forty-five miles distant from Upsala), after the country had been inhabited by man. I described, in the 'Philosophical Transactions ' for 1835, the section there laid open in digging a level in 1819, which showed that a subsidence followed by a re-elevation of land, each movement amounting to more than sixty feet, had occurred since the time when a rude hut had been built on the ancient shore. The wooden frame of the hut, with a ring of hearthstones on the floor, and much charcoal, were found, and over them marine strata, more than sixty feet thick, containing the dwarf variety of Mytilus edulis, and other brackish -water shells of the Bothnian Gulf. Some vessels put together with wooden pegs, of anterior date to the use of metals, were also embedded in parts of the same marine for mation, which has since been raised, so that the upper beds are more than sixty feet above the sea-level, the hut being thus restored to about its original position relatively to the sea. We have seen in the account of the Danish ' shell-mounds,' or 4 refuse-heaps,' of the recent period (p. 13), that even at the comparatively late period of their origin the waters of the Baltic had been rendered more salt than they are now. The Upsala erratics may belong to nearly the same era as those * refuse-heaps.' But were we to go back to a long antecedent epoch, or to that of the Belgian and British caves with their CHAP. XIIT. GLACIAL PERIOD IN SCOTLAND. 241 extinct animals, and the signs they afford of a state of phy sical geography departing widely from the present, or to the era of the implement-bearing alluvium of St. Acheul, we might expect to find Scandinavia overwhelmed with glaciers, and the country uninhabitable by man. At a much remoter period the same country was in the state in which Greenland now is, overspread with one uninterrupted coating of conti nental ice, which has left its peculiar markings on the highest mountains. This period, probably anterior to the earliest traces yet brought to light of the human race, may have coincided with the submergence of England, and the accumu lation of the boulder-clay of Norfolk, Suffolk, and Bedford shire, before mentioned. It has already been stated that the syenite and some other rocks of the Norfolk till (p. 218) seem to have come from Scandinavia, and there is no era when icebergs are so likely to have floated them so far south as when the whole of Sweden and Norway were enveloped in a massive crust of ice ; a state of things the existence of which is deduced from the direction of the glacial furrows, and their frequent unconformity to the shape of the minor valleys. Glacial Period in Scotland. Mr. Eobert Chambers, after visiting Norway and Sweden, and comparing the signs of glacial action observed there with similar appearances in the Grampians, came to the con clusion that the Highlands both of Scandinavia and Scotland had once been ; moulded in ice,' and that the outward and downward movement and pressure of the frozen mass had not only smoothed, polished, and scratched the rocks, but had, in the course of ages, deepened and widened the valleys, and produced much of that denudation which has commonly been ascribed exclusively to aqueous action. The glaciation R 242 GLACIAL PEEIOD IN SCOTLAND. CHAP. xm. of the Scotch mountains was traced by him to the height of at least three thousand feet.* Professor Agassiz, after his tour in Scotland in 1840, announced the opinion that erratic blocks had been dispersed from the Scottish mountains as from an independent centre, and that the capping of ice had been of extraordinary thickness. Mr. T. F. Jamieson, of Ellon, in Aberdeenshire, has recently brought forward an additional body of facts in support of this theory. According to him the Grampians were at the period of extreme cold enveloped 'in one great winding sheet of snow and ice,' which reached everywhere to the coast-line, the land being then more elevated than it is now. He describes the glacial furrows sculptured on the solid rocks as pointing in Aberdeenshire to the south-east, those of the valley of the Forth at Edinburgh, from west to east, and higher up the same valley at Stirling, from north west to south-east, as they should do if the ice had followed the lines of what is now the principal drainage. The obser vations of Sir James Hall, Mr. Maclaren, Mr. Chambers, and Dr. Fleming, are cited by him in confirmation of this ar rangement of the glacial markings, while in Sutherland and Kossshire he shows that the glacial furrows along the north coast point northwards, and in Argyleshire westwards, always in accordance with the direction of the principal glens and fiords. Another argument is also adduced by him in proof of the ice having exerted its mechanical force in a direction from the higher and more inland country to the lower region and sea coast. Isolated hills and minor prominences of rock are often polished and striated on the land side, while they remain rough and jagged on the side fronting the sea. This may be seen both on the east and west coast, Mention is also made * Ancient Sea Margins, Edinburgh, New Philosophical Journal, April 1848. Glacial Phenomena, Edinburgh 1853, and January 1855. CHAP. xm. SUBMERGENCE OF SCOTLAND. 243 of blocks of granite which have travelled from south to north in Aberdeenshire, of which there would have been no ex amples had the erratics been all brought by floating ice from the arctic regions when Scotland was submerged. It is also urged against the doctrine of attributing the general glacia- tion to submergence, that the glacial grooves, instead of ra diating as they do from a centre, would, if they had been due to ice coming from the north, have been parallel to the coast-line, to which they are now often almost at right angles. The argument, moreover, which formerly had most weight in favour of floating ice, namely, that it explained why so many of the stones did not conform to the contour and direction of the minor hills and valleys, is now brought forward, and with no small effect, in favour of the doctrine of continental ice on the Greenlandic scale, which, after levelling up the lesser inequalities, would occasionally flow in mighty ice-currents, in directions often at a high angle to the smaller ridges and glens. The application to Scandinavia and Scotland of this theory makes it necessary to reconsider the validity of the proofs formerly relied on as establishing the submergence of a great part of Scotland beneath the sea, at some period subsequent to the commencement of the glacial period. In all cases where marine shells overlie till, or rest on polished and striated surfaces of rock, the evidence of the land having been under water, and having been since upheaved, remains un shaken ; but this proof alone rarely extends to heights ex ceeding five hundred feet. In the basin of the Clyde we have already seen that recent strata occur twenty-five feet above the sea-level, with existing species of marine testacea, and with buried canoes, and other works of art. At the higher level of forty feet occurs the well-known raised beach of the western coast, which, according to Mr. Jamieson, contains, near Fort William and on Loch Fyne and elsewhere, an assem- E 2 244 SUBAQUEOUS DRIFT IN PERTHSHIRE. CHAP. XIII. blage of shells implying a colder climate than that of the twenty-five foot terrace, or that of the present sea ; just as, in the Valley' of the Soinme, the higher level gravels are sup posed to belong to a colder period than the lower ones, and still more decidedly than that of the present era (see p. 142). At still greater elevations, older beds containing a still more arctic group of shells have been observed at Airdrie, fourteen miles south-east of Glasgow, 524 feet above the level of the sea. They were embedded in stratified clays, with the un- stratified boulder till both above and below them, and in the overlying unstratified drift were some boulders of granite which must have come from distances of sixty miles at the least.* The presence of Tellina calcarea, and several other northern shells, implies a climate colder than that of the present Scottish seas. In the north of Scotland, marine shells have been found in deposits of the same age in Caithness and in Aberdeenshire at heights of two hundred and fifty feet, and on the shores of the Moray Frith, as at Gramrie in Banff, at an elevation of three hundred and fifty feet ; and the stratified sands and beds of pebbles which belong to the same formation ascend still higher to heights of five hundred feet at least. f At much greater heights, stratified masses of drift occur in which hitherto no organic remains, whether of marine or freshwater animals., have ever been found. It is still an un decided question whether the origin of all such deposits in the G-rampians can be explained without the intervention of the sea. One of the most conspicuous examples has been described by Mr. Jamieson as resting on the flank of a hill called Meal Uaine, in Perthshire, on the east side of the valley of the Tummel, just below Killiecrankie. It consists of per- * Smith of Jordanhill, Quarterly ceedings of the Geological Society, Geological Journal, vol. vi. p. 387, vol. ii. p. 545 ; and T. F. Jamieson, 1850. Geological Quarterly Journal, vol. f See papers by Prestwich, Pro- xvi. CH.4P. XIII. SUBAQUEOUS DRIFT IN PERTHSHIRE. 2-15 fectly horizontal strata, the lowest portion of them 300 feet above the river and 600 feet above the sea. From this elevation to an altitude of nearly 1,200 feet the same series of strata is traceable, continuously, up the slope of the moun tain, and some patches are seen here and there even as high as 1,550 feet above the sea. They are made up in great part of finely laminated silt, alternating with coarser materials, through which stones from four to five feet in length are scattered. These large boulders, and some smaller ones, are polished on one or more sides, and marked with glacial striae. The sub jacent rocks, also, of gneiss, mica slate, and quartz, are every where grooved and polished as if by the passage of a glacier.* At one spot a vertical thickness of 130 feet of this series of strata is exposed to view by a mountain torrent, and in all more than 2,000 layers of clay, sand, and gravel were counted, the whole evidently accumulated under water. Some beds consist of an impalpable mud-like putty, apparently derived from the grinding down of felspar, and resembling the mud produced by the grinding action of modern glaciers. Mr. Jamieson, when he first gave an account of this drift, inferred, in spite of the absence of marine shells, that it implied the submergence of Scotland beneath the ocean after the commencement of the glacial period, or after the era of continental ice indicated by the subjacent floor of polished and grooved rock. This conclusion would require a submer gence of the land as far up as 1,550 feet above the present sea-level, after which a great re-upheaval must have occurred. But the same author, having lately revisited the valley of the Tummel, suggests another possible, and I think probable, explanation of the same phenomena. The stratified drift in question is situated in a deep depression between two but tresses of rock, and if an enormous glacier be supposed to * Jamieson, Geological Quarterly Journal, vol. xvi. p. 360. 246 RE-ELEVATION OF SCOTLAND. CHAP. xin. have once filled the valley of the Tummel to the height of the stratified drift, it may have dammed up the mouth of a mountain torrent by a transverse barrier, giving rise to a deep pond, in which beds of clay and sand brought down by the waters of the torrent were deposited. Charpentier in his work on the Swiss glaciers has described many such recep tacles of stratified matter now in progress, and due to such blockages, and he has pointed out the remnants of ancient and similar formations left by extinct glaciers of an earlier epoch. He specially notices that angular stones of various dimensions, often polished and striated, which rest on the glacier and are let fall when the torrent undermines the side of the moving ice, descend into the small lake and be come interstratified with the gravel and fine sediment brought down by the torrent into the same.* The evidence of the former sojourn of the sea upon the land after the commencement of the glacial period was for merly inferred from the height to which erratic blocks derived from distant regions could be traced, besides the want of conformity in the glacial furrows to the present contours of many of the valleys. Some of these phenomena may now, as we have seen, be accounted for by assuming that there was once a crust of ice resembling that now covering Greenland. The Grampians in Forfarshire and in Perthshire are from 3,000 to 4,000 feet high. To the southward lies the broad and deep valley of Strathmore, and to the south of this again rise the Sidlaw Hills to the height of 1,500 feet and upwards. On the highest summits of this chain, formed of sandstone and shale, and at various elevations, I have observed huge angular fragments of mica-schist, some three and others fifteen feet in diameter, which have been conveyed for a distance of at least fifteen miles from the nearest Grampian rocks from which they could have been detached, * Charpentier, Essai sur les Glaciers, p. 63, 1841. CHAP. XIII. RE-ELEVATION OF SCOTLAND. 247 Others have been left strewed over the bottom of the large intervening vale of Strathmore.* It may be argued that the transportation of such blocks may have been due not to floating ice, but to a period when Strathmore was filled up with land ice, a current of which ex tended from the Perthshire Highlands to the summit of the Sidlaw Hills, and the total absence of marine or freshwater shells from all deposits, stratified or unstratified, which have any connection with these erratics in Forfarshire and Perth shire may be thought to favour such a theory. But the same mode of transport can scarcely be imagined for those fragments of mica-schist, one of them weighing from eight to ten tons, which were observed much farther south by Mr. Maclaren on the Pentland Hills, near Edinburgh, at the height of 1,100 feet above the sea, the nearest mountain composed of this formation being fifty miles distant.! On the same hills, also, at all elevations, stratified gravels occur which, although devoid of shells, it seems hardly possible to refer to any but a marine origin.f Although I am willing, therefore, to concede that the glaciation of the Scotch mountains, at elevations exceeding 2,000 feet, may be explained by land ice, it seems difficult not to embrace the conclusion that a subsidence took place not merely of 500 or 600 feet, as demonstrated by the marine shells, but to a much greater amount, as shown by the present position of erratics and some patches of stratified drift. The absence of marine shells at greater heights than 525 feet above the sea, will be treated of in a future chapter. It may in part, perhaps, be ascribed to the action of glaciers, which swept out marine strata from all the higher valleys, after the re-emergence of the land. * Proceedings of the Geological f Maclaren, Geology of Fife, &c., Society, vol. iii. p. 344. p. 220. 248 LATEST GLACIAL CHANGES IN SCOTLAND. CHAP. xui. Latest Changes produced by Glaciers in Scotland. We may next consider the state of Scotland after its emergence from the glacial sea, when we cannot fail to be approaching the time when man coexisted with the mammoth and other mammalia now extinct. In a paper which I published in 1840, on the ancient glaciers of Forfar- shire, I endeavoured to show that some of these existed after the mountains and glens had acquired precisely their present shape,* and had left moraines even in the minor valleys, just where they would now leave them were the snow and ice again to gain ground. I described also one remarkable transverse mound, evidently the terminal moraine of a retreating glacier, which crosses the valley of the South Esk, a few miles above the point where it issues from the Grampians, and about six miles below the town of Clova. It is situated at a place called Grlenairn (perhaps 700 feet above the level of the sea), where the valley is half a mile broad and is bounded by steep and lofty mountains. The valley immediately above this transverse barrier expands into a wide alluvial plain, which has evidently once been a lake. The barrier itself, nearly 200 feet high, consists in its lower part of till with boulders, 80 feet thick, precisely resem bling the moraine of a Swiss glacier, above which there is a mass of stratified sand 100 feet thick, which has the appear ance of consisting of the materials of the moraine re-arranged in a stratified form, possibly by the waters of a glacier lake. The structure of the entire barrier has been laid open by the Esk, which has cut through it a deep passage about 300 yards wide. I have also given an account of another striking feature in the physical geography of Perthshire and Forfarshire, which I * Proceedings of the Geological Society, vol. iii. p. 337. CHAP. XIII. FORFARSHIRE ZONE OF BOULDER CLAY. 249 consider to belong to the same period; namely, a continuous zone of boulder clay, forming ridges and mounds from fifty to seventy feet high (the upper part of the mounds usually stratified), enclosing numerous lakes, some of them several miles long, and many ponds and swamps filled with shell-marl and peat. This band of till, with Grampian boulders and associated river-gravel, may be traced con tinuously for a distance of thirty-four miles, with a width of three and a half miles, from near Dunkeld, by Coupar, to the south of Blairgowrie, then through the lowest part of Strath- more, and afterwards in a straight line through the greatest depression in the Sidlaw Hills, from Forfar to Lunan Bay. Although no great river now takes its course through this line df ancient lakes, moraines, and river gravel, yet it evi dently marks an ancient line by which, first, a great glacier descended from the mountains to the sea, and by which, secondly, at a later period, the principal water drainage of this country was effected. The subsequent modification in geo graphy is comparable in amount to that which has taken place since the higher level gravels of the Valley of the Somme were formed, or since the Belgian caves were filled with mud and bone-breccia. Mr. Jamieson has remarked, in reference to this and some other extinct river-channels of corresponding date, that we have the means of ascertaining the direction in which the waters flowed by observing the arrangement of the oval and flattish pebbles in their deserted channels ; for in the bed of a fast-flowing river such pebbles are seen to dip towards the current, as represented in fig. 35, such being the position of greatest resistance to the stream.* If this be admitted, it follows that the higher or mountainous country bore the same relation to the lower lands, at the time when a great river passed through this chain of lakes, as it does at present. * Jamieson, Quarterly Geological Journal, vol. xvi. p. 349. 250 ORGANIC REMAINS IN SCOTCH BOULDER CLAY. CHAP. xin. Fig. 35 We also seem to have a test of the comparatively modern origin of the mounds of till which surround the above men tioned chain of lakes (of which that of Forfar is one), in the species of organic remains contained in the shell-marl deposited at their bottom. All the mammalia as well as shells are of recent species. Unfortunately, we have no infor mation as to the fauna which inhabited the country at the time when the till itself was formed. There seem to be only three or four instances as yet known in all Scotland of mammalia having been discovered in boulder clay. Mr. E. Bald has recorded the circumstances under which a single elephant's tusk was found in the unstratified drift of the Valley of the Forth, with the minuteness which such a discovery from its rarity well deserved. He distinguishes the boulder clay, under the name of ' the old alluvial cover,' from that more modern alluvium, in which the whales of Airthrie, described at p. 53, were found. This cover he says is sometimes one hundred and sixty feet thick. Having never observed any organic remains in it, he watched with curiosity and care the digging of the Union Canal between Edinburgh and Falkirk, which passed for no less than twenty- eight miles almost continuously through it. Mr. Baird the engineer, who superintended the works, assisted in the inquiry, and at one place only in this long section did they meet with a fossil, namely, at Cliftonhall, in the valley of the Almond. It lay at a depth of between fifteen and twenty feet from the surface, in very stiff clay, and consisted of an elephant's tusk, thirty-nine inches long and thirteen in circumference, in so fresh a state that an ivory turner purchased it and turned part of it into chessmen before it was rescued from destruction. CHAP. XIIT. ORGANIC REMAINS IN SCOTCH BOULDER CLAY. 251 The remainder is still preserved in the museum at Edinburgh, but by exposure to the air it has shrunk considerably.* In 1817, two other tusks and some bones of the elephant, as we learn from the same authority (Mr. Bald), were met with, three and a half feet long and thirteen inches in circumference, lying in an horizontal position, seventeen feet deep in clay, with marine shells, at Kilmaurs, in Ayrshire. The species of shells are not given. f In another excavation through the Scotch boulder clay, made in digging the Clyde and Forth Junction Railway, the antlers of a reindeer were found at Croftamie, in Dumbartonshire, in the basin of the river Endrick, which flows into Loch Lomond. They had cut through twelve feet of till with angular and rounded stones, some of large size, and then through six feet of underlying clay, when they came upon the deer's horns, eighteen feet from the surface, and within a foot of the sandstone on which the till rested. At the distance of a few yards, and in the same position, but a foot or two deeper, were observed marine shells, Cyprina is- landica, Astarte elliptica, A. compressa, Fusus antiquus, Littorina littorea, and a Balanus. The height above the level of the sea was between one hundred and one hundred and three feet. The reindeer's horn was seen by Professor Owen, who considered it to be that of a young female of the large variety, called by the Hudson's Bay trappers the carabou. The remains of elephants, now in the museums of Glasgow and Edinburgh, purporting to come from the superficial deposits of Scotland have been referred to Mephas pri- migenius. In cases where tusks alone have been found unaccompanied by molar teeth, such specific determinations may be uncertain ; but if any one specimen be correctly * Memoirs of the Wernerian Society, Edinburgh, vol. iv. p. 58. f Ibid., vol. iv. p. 63. 252 PARALLEL ROADS OF GLEN ROY. CHAP. xm. named, the occurrence of the mammoth and reindeer in the Scotch boulder-clay, as both these quadrupeds are known to have been contemporary with man, favours the idea which I have already expressed, that the close of the glacial period in the Grampians may have coincided in time with the existence of man in those parts of Europe where the climate was less severe, as, for example, in the basins of the Thames, Somme, and Seine, in which the bones of many extinct mammalia are associated with flint implements of the antique type. Parallel Roads of Glen Roy in Scotland. Perhaps no portion of the superficial drift of Scotland can lay claim to so modern an origin on the score of the fresh ness of its aspect, as that which forms what are called the Parallel Roads of Grlen Roy. If they do not belong to the recent epoch, they are at least posterior in date to the pre sent outline of mountain and glen, and to the time when every one of the smaller burns ran in their present channels, though some of them have since been slightly deepened. The perfect horizontally, moreover, of the roads, one of which is continuous for about twenty miles from east to west, and twelve miles from north to south, shows that since the era of their formation no change has taken place in the relative levels of different parts of the district. Grlen Roy is situated in the Western Highlands, about ten miles north of Fort William, near the western end of the great glen of Scotland, or Caledonian Canal, and near the foot of the highest of the Grampians, Ben Nevis. (See map, p. 254.) Throughout nearly its whole length, a distance of more than ten miles, three parallel roads or shelves are traced along the steep sides of the mountains, as represented in the annexed view, Plate II., by the late Sir T. Lander Dick, each maintain ing a perfect horizontally, and continuing at exactly the V, I ! fc ilt o ?, CHAP. XIII. PARALLEL EOADS OF GLEN ROT. 253 same level on the opposite sides of the glen. Seen at a distance, they appear like ledges, or roads, cut artificially out of the sides of the hills ; but when we are upon them, we can scarcely recognise their existence, so uneven is their surface, and so covered with boulders. They are from ten to sixty feet broad, and merely differ from the side of the mountain by being somewhat less steep. On closer inspection, we find that these terraces are stra tified in the ordinary manner of alluvial or littoral deposits, as may be seen at those points where ravines have been excavated by torrents. The parallel shelves, therefore, have not been caused by denudation, but by the deposition of detritus, precisely similar to that which is dispersed in smaller quantities over the declivities of the hills above. These hills consist of clay-slate, mica schist, and granite, which rocks have been worn away and laid bare at a few points immediately above the parallel roads. The lowest of these roads is about 850 feet above the level of the sea, the next about 212 feet higher, and the third 82 feet above the second. There is a fourth shelf, which occurs only in a contiguous valley called Grlen Grluoy, which is twelve feet above the highest of all the Glen Eoy roads, and consequently about 1,156 feet above the level of the sea.* One only, the lowest of the three roads of Grlen Eoy, is continued throughout Grlen Spean, a large valley with which Grlen Eoy unites. (See Plate II. and map, fig. 36.) As the shelves, having no slope towards the sea like ordinary river terraces, are always at the same absolute height, they become continually more elevated above the river in proportion as we descend each valley ; and they at length terminate very abruptly, without any obvious cause, or any change either in the shape of the ground or in the composition or hardness of the rocks. * Another detached shelf also occurs at Kilfinnan. (See Map, p. 254.) 254 MAP OF PARALLEL ROADS OF GLEN ROY. CHAP. xm. CHAP xin. PARALLEL ROADS OF GLEN ROY. 255 I should exceed the limits of this work, were I to attempt to give a full description of all the geographical circumstances attending these singular terraces, or to discuss the ingenious theories which have been severally proposed to account for them by Dr. Macculloch, Sir T. Lauder, and Messrs. Darwin, Agassiz, Milne, and Chambers. There is one point, how ever, on which all are agreed, namely, that these shelves are ancient beaches, or littoral formations, accumulated rotfad the edges of one or more sheets of water which once stood for a long time successively at the level of the several shelves. It is well known, that wherever a lake or marine fiord exists surrounded by steep mountains subject to disintegra tion by frost or the action of torrents, some loose matter is washed down annually, especially during the melting of snow, and a check is given to the descent of this detritus at the point where it reaches the waters of the lake. The waves then spread out the materials along the shore, and throw some of them upon the beach; their dispersing power being aided by the ice, which often adheres to pebbles during the winter months, and gives buoyancy to them. The annexed diagram illustrates the manner in which Dr. Maccul loch and Mr. Darwin suppose 6 the roads' to constitute mere excres cences of the superficial alluvial coating which rests upon the hill side, and consists chiefly of clay and sharp unrounded stones. Among Other proofs that the A B. Supposed original surface parallel roads have really been CD . Bo^tr shelves in the formed along the margin of a sheet outer alluvial covering of the hill. of water, it may be mentioned, that wherever an isolated hill rises in the middle of the glen above the level of any particular shelf, as in Mealderry, Plate II., a 256 THEORY OF AGASSIZ. CHAP. xm. corresponding shelf is seen at the same level passing round the hill, as would have happened if it had once formed an island in a lake or fiord. Another very remarkable pecu liarity in these terraces is this ; each of them comes in some portion of its course to a col, or parting ridge between the heads of glens, the explanation of which will be considered in the sequel. 'Those writers who first advocated the doctrine that the roads were the ancient beaches of freshwater lakes, were unable to offer any probable hypothesis respecting the for mation and subsequent removal of barriers of sufficient height and solidity to dam up the water. To introduce any violent convulsion for their removal was inconsistent with the unin terrupted horizontality of the roads, and with the undisturbed aspect of those parts of the glens where the shelves come suddenly to an end. Mr. Agassiz and Dr. Buckland, desirous, like the defenders of the lake theory, to account for the limitation of the shelves to certain glens, and their absence in contiguous glens, where the rocks are of the same composition, and the slope and in clination of the ground very similar, first started the theory that these valleys were once blocked up by enormous glaciers descending from Ben Nevis, giving rise to what are called, in Switzerland and in the Tyrol, glacier-lakes. In corroboration of this view, they contended that the alluvium of Grlen Roy, as well as of other parts of Scotland, agrees in character with the moraines of glaciers seen in the Alpine valleys of Switzer land. It will readily be conceded that this hypothesis was preferable to any previous lacustrine theory, by accounting more easily for the temporary existence and entire disappear ance of lofty transverse barriers, although the height required for the supposed dams of ice appeared very enormous. Before the idea of glacier-lakes had been suggested by Agassiz, Mr. Darwin examined Glen Roy, and came to the CHAP. xiii. DAKWIN ON PARALLEL ROADS. 257 opinion that the shelves were formed when the glens were still arms of the sea, and, consequently, that there never were any seaward barriers. According to him, the land emerged during a slow and uniform upward movement, like that now experienced throughout a large part of Sweden and Finland ; but there were certain pauses in the upheaving process, at which times the waters of the sea remained stationary for so many centuries as to allow of the accumulation of an extra ordinary quantity of detrital matter, and the excavation, at many points immediately above the sea-level, of deep notches and bare cliffs in the hard and solid rock. This theory I adopted in 1841 (' Elements,' 2nd ed.), as ap pearing to me less objectionable than any other then proposed. The phenomena most difficult to reconcile with it are, first, the abrupt cessation of the roads at certain points in the different glens ; secondly, their unequal number in different valleys connecting with each other, there being three, for example, in Glen Eoy, and only one in Grlen Spean ; thirdly, the precise horizontality of level maintained by the same shelf over a space many leagues in length, requiring us to assume, that during a rise of 1,156 feet no one portion of the land was raised even a few yards above another ; fourthly, the coincidence of level already alluded to of each shelf with a col, or the point form ing the head of two glens, from which the rain-waters flow in opposite directions. This last-mentioned feature in the physical geography of Lochaber Mr. Darwin endeavoured to explain in the following manner. He called these cols ( land-straits,' and regarding them as having been anciently sounds or channels between islands, he pointed out that there is a tendency in such sounds to be silted up, and always the more so in proportion to their narrowness. In a chart of the Falkland Islands, by Capt. Sullivan, E.N., it appears that there are several examples there of straits where the soundings diminish regularly towards the narrowest part. 258 DARWIN ON PARALLEL ROADS. CHAP. xm. One is so nearly dry that it can be walked over at low water, and another, no longer covered by the sea, is supposed to have recently dried up in consequence of a small alteration in the relative level of sea and land. ( Similar straits,' observes Mr. Chambers, 'hovering, in character, between sea and land, and which may be called fords, are met with in the Hebrides. Such, for example, is the passage dividing the islands of Lewis and Harris, and that between North Uist and Benbecula, both of which would undoubtedly appear as cols, coinciding with a terrace or raised beach, all round the islands if the sea were to subside.'* The first of the difficulties above alluded to, namely, the non-extension of the shelves over certain parts of the glens, might be explained, said Mr. Darwin, by supposing in certain places a quick growth of green turf on a good soil, which prevented the rain from washing away any loose materials lying on the surface. But wherever the soil was barren, and where green sward took long to form, there may have been time for the removal of the gravel. In one case an intermediate shelf appears for a short distance (three quarters of a mile) on the face of the mountain called Tomb- hran, between the two upper shelves, and is seen nowhere else. It occurs where there was the longest space of open water, and where the waves may have acquired a more than ordinary power to heap up detritus. The unequal number of the shelves in valleys communi cating with each other, and in which the boundary rocks are similar in composition, and the general absence of any shelves at corresponding altitudes in glens on the opposite watershed, like that of the Spey, and in valleys where the waters flow eastward, are difficulties attending the marine theory which have never yet been got over. Mr. T. F. Jamieson, before * Ancient Sea Margins, p. 114, by R. Chambers. CHAP. xin. THEORY OF AGASSIZ CONFIRMED. 259 cited, has, during a late visit to Lochaber, in 1861, observed many facts highly confirmatory of the hypothesis of glacier- lakes which, as I have already stated, was originally advanced by Mr. Agassiz. In the first place, he found much superficial scoring and polishing of rocks, and accumulation of boulders at those points where signs of glacial action ought to appear, if ice had once dammed up the waters of the glens in which the 'roads' occur. Ben Nevis may have sent down its glaciers from the south, and Glen Arkeg from the north, for the mountains at the head of the last-mentioned glen are 3,000 feet high, and may, together with other tributary glens, have helped to choke up the great Caledonian valley with ice, so as to block up for a time the mouths of the Spean, Eoy, and Grluoy. The temporary conversion of these glens into glacier-lakes is the more conceivable, because the hills at their upper ends not being lofty nor of great extent, they may not have been filled with ice at a time when great glaciers were generated in other adjoining and much higher regions. 2ndly. The shelves, says Mr. Jamieson, are more precisely defined and unbroken than any of the raised beaches or ac knowledged ancient coast-lines visible on the west of Scotland, as in Argyleshire, for example. Srdly. At the level of the lower shelf in Grlen Koy, at points where torrents now cut channels through the shelf as they descend the hill-side, there are small delta-like extensions of the shelf, perfectly preserved, as if the materials, whether fine or coarse, had originally settled there in a placid lake, and had not been acted upon by tidal currents, mingling them with the sediment of other streams. These deltas are too entire to allow us to suppose that they have at any time since their origin been exposed to the waves of the sea. 4thly. The alluvium on the e cols' or watersheds, before alluded to, is such as would have been formed if the waters s 2 260 PARALLEL ROADS OF GLEN ROY CHAP, xn of the rivers had been made to flow east, or out of the upper ends of the supposed glacier-lakes, instead of escaping at the lower ends, in a westerly direction, where the great blockages of ice are assumed to have occurred. In addition to these arguments of Mr. Jamieson, I may mention that in Switzerland, at present, no testacea live in the cold waters of glacier-lakes ; so that the entire absence of fossil shells, whether marine or freshwater, in the stratified materials of each shelf, would be accounted for, if the theory above mentioned be embraced. When I examined 'the parallel roads' in 1825, in com pany with Dr. Buckland, neither this glacier theory nor Mr. Darwin's suggestion of ancient sea-margins had been pro posed, and I have never since revisited Lochaber. But I retain in my memory a vivid recollection of the scenery and physical features of the district, and I now consider the glacier-lake theory as affording by far the most satisfactory solution of this difficult problem. The objection to it, which until lately appeared to be the most formidable, and which led Mr. Kobert Chambers in his ' Sea Margins ' to reject it entirely, was the difficulty of conceiving how the waters could be made to stand so high in Grlen Roy, as to allow the upper most shelf to be formed. Grant a barrier of ice in the lower part of the glen, of sufficient altitude to stop the waters from flowing westward, still, what prevented them from escaping over the c col ' at the head of Grlen Glaster ? This ' col ' coin cides exactly in level, as Mr. Milne Home first ascertained, with the second or middle shelf of Grlen Roy. The difficulty here stated appears now to be removed by supposing that the higher lines or roads were formed before the lower ones, and when the quantity of ice was most in excess. We must ima gine that at the time when the uppermost shelf of Grlen Roy was forming in a shallow lake, the lower part of that glen was filled up with ice, and, according to Mr. Jamieson, a CHAP. xin. DUE TO GLACIER-LAKES. 261 glacier from Loch Treig then protruded itself across Glen Spean, and rested on the flank of the hill on the opposite side in such a manner as effectually to prevent any water from escaping over the Glen Glaster ' col.' The proofs of such a glacier having actually existed at the point in question consist, he says, in numerous cross striae observable in the bottom of Glen Spean, and in the presence of moraine matter in considerable abundance on the flanks of the hill extending to heights above the Glen Glaster ' col.' When the ice shrank into less dimensions the second shelf would be formed, having its level determined by the col last mentioned, Glen Spean in the meantime being filled with a glacier. Finally, the ice blockage common to Glens Eoy, Spean, and Laggan, which consisted probably of a glacier from Ben Nevis, gave rise to the lowest and most extensive lake, the waters of which escaped over the pass of Muckul or the ( col' at the head of Loch Laggan, which, as Mr. Jamieson has now ascertained, agrees precisely in level with the lowest of all the shelves, and where there are unequivocal signs of a river having flowed out for a considerable period. Dr. Hooker has described some parallel terraces, very analogous in their aspect to those of Glen Roy, as existing in the higher valleys of the Himalaya, of which his pencil has given us several graphic illustrations. He believes these Indian shelves to have originated on the borders of glacier- lakes, the barriers of which were usually formed by the ice and moraines of lateral or tributary glaciers, which descended into and crossed the main valley, as we have supposed in the case of Glen Eoy; but others he ascribes to the terminal moraine of the principal glacier itself, which had retreated during a series of milder seasons, so as to leave an interval between the ice and the terminal moraine. This interspace caused by the melting of ice becomes filled with water and forms a lake, the drainage of which usually takes place by 262 COMPARATIVELY MODERN DATE OF THE CHAP. XIIT. percolation through the porous parts of the moraine, and not by a stream overflowing that barrier. Such a glacier-lake Dr. Hooker actually found in existence near the head of the Yangma valley in the Himalaya. It was moreover partially bounded by recently formed marginal terraces or parallel roads, implying changes of level in the barrier of ice and moraine matter.* It has been sometimes objected to the hypothesis of glacier- lakes, as applied to the case of Glen Roy, that the shelves must have taken a very long period for their formation. Such a lapse of time, it is said, might be consistent with the theory of pauses or stationary periods in the rise of the land during an intermittent upward movement, but it is' hardly compatible with the idea of so precarious and fluctuating a barrier as a mass of ice. But the reader will have seen that the perma nency of level in such glacier-lakes has no necessary con nection with minor changes in the height of the supposed dam of ice. If a glacier descending from higher mountains through a tributary glen enters the main valley in which there happens to be no glacier, the river is arrested in its course and a lake is formed. The dam may be constantly repaired and may vary in height several hundreds of feet without affecting the level of the lake, so long as the surplus waters escape over a c col' or parting ridge of rock. The height at which the waters remain stationary is determined solely by the elevation of the ' col,' and not by the barrier of ice, provided the barrier is higher than the ' col.' But if we embrace the theory of glacier-lakes, we must be prepared to assume not only that the sea had nothing to do with the original formation of the e parallel roads,' but that it has never, since the disappearance of the lakes, risen in any one of the glens up to the level of the lowest shelf, which * Hooker, Himalaya Journal, vol. i. also profited by the author's personal p. 242 ; ii. pp. 119, 121, 166. I have explanations. CHAP. xin. PARALLEL ROADS OP GLEN ROY. 263 is about 850 feet high ; for in that case the remarkable per sistency and integrity of the roads and deltas, before described, must have been impaired. We have seen (p. 244) that fifty miles to the south of Lochaber, the glacier formations of Lanarkshire with marine shells of arctic character have been traced to the height of 524 feet. About fifty miles to the south-east in Perthshire are those stratified clays and sands, near Killiecrankie, which were once supposed to be of submarine origin, and which in that case would imply the former submergence of what is now dry land to the extent of 1,550 feet, or several hundred feet beyond the highest of the parallel roads. Even granting that these laminated drifts may have had a different origin, as above suggested (p. 246), there are still many facts connected with the distribution of erratics and the striation of rocks in Scotland which are not easily accounted for with out supposing the country to have sunk, since the era of con tinental ice, to a greater depth than 525 feet, the highest point to which marine shells have yet been traced. After what was said of the pressure and abrading power of a general crust of ice, like that now covering Greenland, it is almost superfluous to say that the parallel roads must have been of later date than such a state of things, for every trace of them must have been obliterated by the movement of such a mass of ice. It is no less clear, that as no glacier-lakes can now exist in Greenland, so there could have been none in Scotland, when the mountains were covered with one great crust of ice. It may, however, be contended, that the parallel roads were produced when the general crust of ice first gave place to a period of separate glaciers, and that no period of deep submergence ever intervened in Lochaber after the time of the lakes. Even in that case, however, it is difficult not to suppose that the G-len Eoy country participated in the downward movement which sank part of Lanarkshire 525 264 DATE OF GLEN EOT TERRACE LINES. CHAP. xm. feet beneath the sea, subsequently to the first great glaciation of Scotland (p. 244). Yet that amount of subsidence might have occurred, and even a more considerable one, without causing the sea to rise to the level of the lowest shelf, or to a height of 850 feet above the present sea-level. This is a question on which I am not prepared at present to offer a decided opinion. Whether the horizontally of the shelves or terrace-lines is really as perfect as has been generally assumed, is a point which will require to be tested by a more accurate trigono metrical survey than has yet been made. The preservation of precisely the same level in the lowest line throughout the Grlens of Roy, Spean and Laggan, for a distance of twenty miles east and west, and ten or twelve miles north and south, would be very wonderful if ascertained with mathematical precision. Mr. Jamieson, after making in 1862 several measurements with a spirit-level, has been led to suspect a rise in the lowest shelf of one foot in a mile in a direction from west to east, or from the mouth of Grlen Roy to a point six miles east of it in Grlen Spean. To confirm such observations, and to determine whether a similar rate of rise continues eastward as far as the pass of Muckul, would be most important. On the whole, I conclude that the Grlen Roy terrace-lines and those of some neighbouring valleys, were formed on the borders of glacier-lakes, in times long subsequent to the principal glaciation of Scotland. They may perhaps have been nearly as late, especially the lowest of the shelves, as that portion of the post-pliocene period in which man coexisted in Europe with the mammoth. CHAP. xiv. EXTINCT GLACIERS IN WALES. 265 CHAPTEE XIV. CHRONOLOGICAL RELATIONS OF THE GLACIAL PERIOD AND THE EARLIEST SIGNS OF MAN'S APPEARANCE IN EUROPE, Continued. SIGNS OP EXTINCT GLACIERS IN WALES GEEAT SUBMERGENCE OP WALES DURING THE GLACIAL PERIOD PROVED BY MARINE SHELLS STILL GREATER DEPRESSION INFERRED FROM STRATIFIED DRIFT SCARCITY OF ORGANIC REMAINS IN GLACIAL FORMATIONS SIGNS OF EXTINCT GLACIERS IN ENGLAND ICE ACTION IN IRELAND MAPS ILLUSTRATING SUCCESSIVE REVOLUTIONS IN PHYSICAL GEOGRAPHY DURING THE POST-PLIOCENE PERIOD SOUTHERNMOST EXTENT OP ERRATICS IN ENGLAND SUCCESSIVE PERIODS OF JUNCTION AND SEPA RATION OF ENGLAND, IRELAND, AND THE CONTINENT TIME REQUIRED FOR THESE CHANGES PROBABLE CAUSES OF THE UPHEAVAL AND SUBSIDENCE OF THE EARTH* S CRUST ANTIQUITY OF MAN CONSIDERED LV RELATION TO THE AGE OF THE EXISTING FAUNA AND FLORA. Extinct Glaciers in Wales. considerable amount of vertical movement in opposite J- directions, which was suggested in the last chapter, as affording the most prohable explanation of the position of some of the stratified and fossiliferous drifts of Scotland, formed since the commencement of the glacial period, will appear less startling, if it can be shown that independent observations lead us to infer that a geographical revolution of still greater magnitude accompanied the successive phases of glaciation through which the Welsh mountains have passed. That Wales was once an independent centre of the dis persion of erratic blocks, has long been acknowledged. Dr. Buckland published in 1842 his reasons for believing that the Snowdonian mountains in Caernarvonshire were formerly 266 WELSH GLACIAL DRIFT. CHAP. xiv. covered with glaciers, which radiated from the central heights through the seven principal valleys of that chain, where striae and flutings are seen on the polished rocks directed towards as many different points of the compass. He also described the f moraines ' of the ancient glaciers, and the rounded masses of polished rock, called in Switzerland ' roches mou- tonnees.' His views respecting the old extinct glaciers of North Wales were subsequently confirmed by Mr. Darwin, who attributed the transport of many of the larger erratic blocks to floating ice. Much of the Welsh glacial drift had already been shown by Mr. Trimmer to have had a sub marine origin, and Mr. Darwin maintained that when the land rose again to nearly its present height, glaciers filled the valleys, and f swept them clean of all the rubbish left by the sea.' * Professor Eamsay, in a paper read to the Geological Society in 1851, and in a later work on the glaciation of North Wales, described three successive glacial periods, during the first of which the land was much higher than it now is, and the quantity of ice excessive ; secondly, a period of submerg ence when the land was 2,300 feet lower than at present, and when the higher mountain tops only stood out of the sea as a cluster of low islands, which nevertheless were covered with snow ; and lastly, a third period when the marine boulder drift formed in the middle period was ploughed out of the larger valleys by a second set of glaciers, smaller than those of the first period. This last stage of glaciation[may have coin cided with that of the parallel roads of Glen Eoy, spoken of in the last chapter. In Wales it was certainly preceded by submergence, and the rocks had been exposed to glacial polishing and friction before they sank. Fortunately the evidence of the sojourn of the Welsh * Philosophical Magazine, ser. 3, voL xxi. p. 180. CHAP. XIT. PROOFS OP SUBMERGENCE. 267 mountains beneath the waters of the sea is not deficient, as in Scotland, in that complete demonstration which the presence of marine shells affords. The late Mr. Trimmer discovered such shells on Moel Tryfane, in North Wales, in drift elevated 1,392 feet above the level of the sea. It appears from his observations, and those of the late Edward Forbes, corroborated by others of Professor Eamsay and Mr. Prestwich, that about twelve species of shells, including Fusus bamfius, F. antiquus, Venus striatula (Forbes and Hanley), have been met with at heights of between 1,000 and 1,400 feet, in drift, reposing on a surface of rock which had been previously exposed to glacial friction 'and striation. The shells, as a whole, are those of the glacial period, and not of the Norwich Crag. Two localities of these shells in Wales, in addition to that first pointed out by Mr. Trimmer, have since been observed by Professor Eamsay, who, however, is of opinion that the amount of submergence can by no means be limited to the extreme height to which the shells happen to have been traced ; for drift of the same character as that of Moel Tryfane extends continuously to the height of 2,300 feet,* Rarity of Organic Remains in Glacial Formations. The general dearth of shells in such formations, below as well as above the level at which Mr. Trimmer first found them, deserves notice. Whether we can explain it or not, it is a negative character which seems to belong very generally to deposits formed in glacial seas. The porous nature of the strata, and the length of time during which they have been permeated by rain-water, may partly account, as we hinted in a former chapter, for the destruction of organic remains. * Eamsay, Quarterly Geological Journal, vol. viii. p. 372, 1852 268 LIFE IN THE OCEAN AT GREAT DEPTHS. CHAP. xiv. But it is also possible that they were originally scarce, for we read of the waters of the sea being so freshened and chilled by the melting of ice-bergs in some Norwegian and Icelandic fiords, that the fish are driven away, and all the mollusca killed. The moraines of glaciers are always from the first devoid of shells, and if transported by ice-bergs to a distance, and deposited where the ice melts, may continue as barren of every indication of life, as they were when they originated. Nevertheless, it may be said, on the other hand, that herds of seals and walruses crowd the floating ice of Spitzbergen in lat. 80 north, of which Mr. Lamont has recently given us a lively picture,* and huge whales fatten on myriads of pteropods in polar regions. It had been suggested that the bottom of the sea, at the era of extreme submergence in Scotland and Wales, was so deep as to reach the zero of animal life, which, in part of the Mediterranean (the Egean, for example), the late Edward Forbes fixed, after a long series of dredgings, at 300 fathoms. But the shells of the glacial drift of Scotland and Wales, when they do occur, are not those of deep seas ; and, moreover, our faith in the unin habitable state of the ocean at great depths has been rudely shaken, by the recent discovery by Captain M'Clintock and Dr. Wallich, of starfish in water more than a thousand fathoms deep (7,560 feet !), midway between Greenland and Iceland. That these radiata were really dredged up from the bottom, and that they had been living and feeding there, appeared from the fact that their stomachs were full of globigerina, of which foraminiferous creatures, both living and dead, the oozy bed of the ocean at that vast depth was found to be exclusively composed. Whatever may be the cause, the fact is certain, that over large areas in Scotland, Ireland, and Wales, I might add * Seasons with the Sea-Horses, 1861. CHAP. XIV. GLACIAL FOKMATIONS IN ENGLAND. 269 throughout the northern hemisphere en both sides of the Atlantic, the stratified drift of the glacial period is very com monly devoid of fossils, in spite of the occurrence here and there, at the height of 500, 700, and even 1,400 feet, of marine shells. These, when met with, belong, with few exceptions, to known living species. I am therefore unable to agree with Mr. Kjerulf that the amount of former submergence can be measured by the extreme height at which shells happen to have been found. Glacial Formations in England. The mountains of Cumberland and Westmoreland, and the English lake district, afford equally unequivocal vestiges of ice- Fig. 38 Dome-shaped rocks, or 'roches moutonnees,' in the valley of the Botha, near Ambleside, from a drawing by E. Hull, F.G-.S.* action not only in the form of polished and grooved surfaces, but also of those rounded bosses before mentioned, as being so abundant in the Alpine valleys of Switzerland, where glaciers exist, or have existed. Mr. Hull has lately published a faithful account of these phenomena, and has given a repre sentation of some of the English 'roches moutonnees,' which * Edinburgh New Philosophical Journal, vol. xi. pi. i. p. 31, 1860. 270 GLACIAL FORMATIONS IN IRELAND. CHAP. xiv. precisely resemble hundreds of dome-shaped protuberances in North Wales, Sweden, and North America.* The marks of glaciation on the rocks, and the trans portation of erratics from Cumberland to the eastward, have been traced by Professor Phillips over a large part of York shire, extending to a height of 1,500 feet above the sea; and similar northern drift has been observed in Lancashire, Cheshire, Derbyshire, Shropshire, Staffordshire, and Worcester shire. It is rare to find marine shells, except at heights of 200 or 300 feet ; but a few instances of their occurrence have been noticed, especially of Turritella communis (a gregarious shell), far in the interior, at elevations of 500 feet, and even of 700 in Derbyshire, and some adjacent counties, as I learn from Mr. Binney and Mr. Prestwich. Such instances are of no small theoretical interest, as enabling us to account for the scattering of large erratic blocks at equal or much greater elevations, over a large part of the northern and midland counties, such as could only have been conveyed to their present sites by floating ice. Of this nature, among others, is a remarkable angular block of syenitic greenstone, four feet and a half by four feet square, and two feet thick, which Mr. Darwin describes as lying on the summit of Ashley Heath, in Staffordshire, 803 feet above the sea, resting on new red sandstone, f Signs of Ice-action and Submergence in Ireland during the Glacial Period. In Ireland we encounter the same difficulty as in Scotland, in determining how much of the glaciation of the higher mountains should be referred to land glaciers, and how much * Hull, Edinburgh New Philoso- shire, Philosophical Magazine, series phical Journal, July 1860. 3, xxi. p. 180. f Ancient Glaciers of Caernarvon- CHAP. xiv. MAMMALIA SCARCE IN IRISH DRIFT. 271 to floating ice, during submergence. The signs of glacial action have been traced by Professor Jukes to elevations of 2,500 feet in the Killarney district, and to great heights in other mountainous regions ; but marine shells have rarely been met with higher than 600 feet above the sea, and that chiefly in gravel, clay and sand in Wicklow and Wexford. They are so rare in the drift east of the Wicklow mountains, that an exception to the rule, lately observed at Ballymore Eustace, by Professor Jukes, is considered as a fact of no small geological interest. The wide extent of drift of the same character, spread over large areas in Ireland, shows that the whole island was, in some part of the glacial period, an archi pelago, as represented in the maps, figs. 39, 40, pp. 276 and 278. Speaking of the Wexford drift, the late Professor E. Forbes states that Sir H. James found in it, together with many of the usual glacial shells, several species which are characteristic of the crag; among others the reversed variety of Fusus antiquuSy called F. contrarius, and the extinct species Nucula Cobboldice, and Turritella incrassata.* Perhaps a portion of this drift of the south of Ireland may belong to the close of the newer pliocene period, and may be of a some what older date than the shells of the Clyde, alluded to at p. 231. They may also correspond still more nearly in age with the fauna of the uppermost strata of the Norwich Crag, occurring at Chillesford, and alluded to p. 199. The scarcity of mammalian remains in the Irish drift favours the theory of its marine origin. In the superficial deposits of the whole island, I have only met with three recorded examples of the mammoth, one in the south near Dungarvan, where the bones of Elephas primigenius, two species of bear (Ursus Arctos, and Ursus spelceus?), the * Forbes' Memoirs of Survey, &c., vol. i. p. 377. 272 DRIFT AND BOULDERS IN IRELAND. CHAP. XIV. rein-deer, horse, &c., were found in a cave ; * another in the centre of the island near Belturbet, in the county of Cavan. Perhaps the conversion into land of the bed of the glacial sea, and the immigration into the newly upheaved region of the elephant, rhinoceros, and hippopotamus, which coexisted with the fabricators of the St. Acheul flint hatchets, were events which preceded in time the elevation of the Irish drift, and the union of that island with England. Ireland may have continued for a longer time in the state of an archipelago, and was therefore for a much shorter time inhabited by the large extinct post-pliocene pachyderms. In one of the reports of the geological survey of Ireland, published in 1859, Professor Jukes, in explanation of sheet 184 of the maps, alludes to beds of sand and gravel, and signs of the polishing and furrowing of the rocks in the counties of Kerry and Killarney, as high as 2,500 feet above the sea, and supposes (perhaps with good reason) that the land was depressed even to that extent. He observes that above that elevation (2,500 feet) the rocks are rough, and not smoothed, as if by ice. Some of the drift was traced as high as 1,500 feet, the highest hills there exceeding 3,400 feet. Mr. Jukes, how ever, is by no means inclined to insist on submergence to the extent of 2,500 feet, as he is aware that ice, like that now prevailing in Greenland, might explain most, if not all, the appearances of glaciation in the highest regions. Although the course taken by the Irish erratics in general is such that their transportation seems to have been due to floating ice or coast-ice, yet some granite blocks have travelled from south to north, as recorded by Sir E. Griffiths, namely, those of the Ox Mountains in Sligo ; a fact from which Mr. Jamieson infers that those mountains formed at one time a centre of dispersion. In the same part of Ireland, * E. Brenan and Dr. Carte, Dublin, 1859. CHAP. xiv. DRIFT AND BOULDERS IN IRELAND. 273 the general direction in which the boulders have travelled is everywhere from north-west to south-east, a course directly at right angles to the prevailing trend of the present mountain ridges. Maps illustrating successive Revolutions in Physical Geography during the Post-pliocene Period. The late Mr. Trimmer, before referred to, has endeavoured to assist our speculations as to the successive revolutions in physical geography, through which the British Islands have passed since the commencement of the glacial period, by four ' sketch maps ' as he termed them, in the first of which he gave an ideal restoration of the original Conti nental period, called by him the first elephantine period, or that of the forest of Cromer, before described (p. 214). He was not aware that the prevailing elephant of that era (E. meridionalis) was distinct from the mammoth. At this era he conceived Ireland and England to have been united with each other and with France, but much of the area re presented as land in the map, fig. 41, p. 279, was supposed to be under water. His second map, of the great submergence of the glacial period, was not essentially different from our map, fig. 39, p. 276. His third map expressed a period of partial re-elevation, when Ireland was reunited to Scotland and the north of England ; but England still separated from France. This restoration appears to me to rest on insufficient data, being constructed to suit the supposed area over which the gigantic Irish deer, or Megaceros, migrated from east to west, also to explain an assumed submergence of the district called the Wealden, in the south-east of England, which had re mained land during the grand glacial submergence. The fourth map is a return to nearly the same continental conditions as the first Ireland, England, and the Continent T 274 MAPS ILLUSTRATING REVOLUTIONS CHAP. xiv. being united. This he called the second elephantine period ; and it would coincide very closely with that part of the post- pliocene era in which man coexisted with the mammoth, and when, according to Mr. Trimmer's hypothesis, the Thames was a tributary of the Rhine.* These geographical speculations were indulged in ten years after Edward Forbes had published his bold generalisations on the geological changes which accompanied the successive establishment of the Scandinavian, Grermanic, and other living floras and faunas in the British Islands, and, like the theories of his predecessor, were the results of much reflection on a vast body of geological facts. It is by repeated efforts of this kind, made by geologists who are prepared for the partial failure of some of their first attempts, that we shall ultimately arrive at a knowledge of the long series of geographical revolutions which have followed each other since the begin ning of the post-pliocene period. The map, fig. 39, p. 276, will give some idea of the great extent of land which would be submerged, were we to infer, as many geologists have done, from the joint evidence of marine shells, erratics, glacial striae and stratified drift at great heights, that Scotland was, during part of the glacial period, 2,000 feet below its present level, and other parts of the British Isles, 1,300 feet. A subsidence to this amount can be demonstrated in the case of North Wales by marine shells (see above, p. 267). In the lake district of Cumberland and Yorkshire," and in Ireland, we must depend on proofs derived from glacial striae and the transportation of erratics for so much of the supposed submergence as exceeds 600 feet. As to central England, or the country north of the Thames and Bristol Channel, marine shells of the glacial period sometimes reach as high as 600 and 700 feet, and erratics still higher, as we have seen above (p. 270). But * Joshua Trimmer, Quarterly Geological Journal, vol. ix. plate xiii. 1853. CHAP. xiv. IN PHYSICAL GEOGRAPHY. 275 this region is of such moderate elevation above the sea, that it would be almost equally laid under water, were there a sinking of no more than 600 feet. To make this last proposition clear, I have constructed, from numerous documents, many of them unpublished, the map, fig. 40, given at p. 278, which shows how that small amount of subsidence would reduce the whole of the British Isles to an archipelago of very small islands, with the excep tion of parts of Scotland, and the north of England and Wales, where four islands of considerable dimensions would still remain. As to the district south of the Thames and the Bristol Channel, it seems to have remained land during the whole of the glacial period at a time when the northern area was under water. The map, fig. 40, p. 278, just alluded to, represents simply the effects of a downward movement of a hundred fathoms, or 600 English feet, supposed to have been uniform over the whole of the British Isles. It shows the very dif ferent state of the physical geography of the area in question, when contrasted with the results of an opposite movement, or one of upheaval, to an equal amount, of which Sir Henry de la Beche had already given us a picture (from which I have borrowed the map, fig. 41, p. 279), in his excellent treatise called ' Theoretical Eesearches.' * If we are surprised when looking at the first map, fig. 40 at the vast expanse of sea which so moderate a subsidence as 600 feet would cause, we shall probably be still more astonished to perceive, in fig. 41, that a rise of the same number of feet would unite all the British Isles, including the Hebrides, Orkneys, and Shetlands, with one another and the continent, and lay dry the sea now separating Great Britain from Sweden and Denmark. * Also repeated in De la Beche' s Geological Observer. T 2 276 MAPS ILLUSTRATING REVOLUTIONS CHAP. xiv. Fig. 39 MAP OF THE BRITISH ISLES AND PAET OF THE NORTH- WEST OF EUROPE, SHOWING THE GREAT AMOUNT OF SUPPOSED SUBMERGENCE OF LAND BENEATH THE SEA DURING PART OF THE GLACIAL PERIOD. The submergence of Scotland is to the extent of 2,000 feet, and of other parts of the British Isles, 1,300. In the map, the dark shade expresses the land which alone remained above water. The area shaded by diagonal lines is that which cannot be shown to have been under water at the period of floating ice by the evi dence of erratics, or by marine shells of northern species. How far the several parts of the submerged area were simultaneously or successively laid under water, 'in the course of the glacial period, cannot, in the present state of our knowledge, be determined. CHAP. xiv. IN BRITISH PHYSICAL GEOGRAPHY. 277 It appears from soundings made during various Admiralty surveys, that the gained land thus brought above the level of the sea, instead of presenting a system of hills and valleys corresponding with those usually characterising the interior of most of our island, would form a nearly level terrace, or gently inclined plane, sloping outwards like those terraces of denudation and deposition which I have elsewhere described as occurring on the coasts of Sicily and the Morea.* It seems that, during former and perhaps repeated oscil lations of level undergone by the British Isles, the sea has had time to cut back the cliffs for miles in many places, while in others the detritus derived from wasting cliffs drifted along the shores, together with the sediment brought down by rivers and swept by currents into submarine valleys, has exerted a levelling power, filling up such depressions as may have pre-existed. Owing to this twofold action few marked inequalities of level have been left on the sea-bottom, the s silver-pits ' off the mouth of the Humber offering a rare exception to the general rule, and even there the narrow depression is less than 300 feet in depth. Beyond the 100 fathom line, the submarine slope sur rounding the British coast is so much steeper that a second elevation of equal amount (or of 600 feet) would add but slightly to the area of gained land ; in other words, the 100 and 200 fathom lines run very near each other. -j" The naturalist would have been entitled to assume the former union, within the post-pliocene period, of all the British Isles with each other and with the continent, as expressed in the map, fig. 41, even if there had been no geological facts in favour of such a junction. For in no other way would he be able to account for the identity of the fauna and flora found throughout these lands. Had they been separated ever since * Manual of Greology, p. 74. f De la Beche, Geological Kesearches, p. 191. 287 MAPS ILLUSTRATING REVOLUTIONS CHAP. xiv. 'Fig. 40 A. MAP SHOWING WHAT PARTS OF THE BRITISH ISLANDS WOULD REMAIN ABOVE WATER AFTER A SUBSIDENCE OF THE AREA TO THE EXTENT OF 600 FEET. The authorities to whom I am indebted for the information contained in this map are for SCOTLAND. A. Geikie, Esq., F.G.S. and T. F. Jamieson, Esq., of Ellon, Aber- deenshire. ENGLAND. For the counties of Yorkshire, Lancashire, and Durham Col. Sir Henry James, E.E. Dorsetshire, Hampshire, and Isle of Wight H. W. Bristow, Esq. Gloucestershire, Somersetshire, and part of Devon E. Etheridge, Esq. Kent and Sussex Frederick Drew, Esq. , Isle of Man W. Whitaker, Esq. IRELAND. Eeduced from a contour map constructed by Lieut. Larcom, E.E., in 1837, for the Eailway Commissioners. CHAP. XIV. IN BRITISH PHYSICAL GEOGRAPHY. Fig. 41 279 MAP OF PART OF THE NORTH-WEST OF EUROPE, INCLUDING THE BRITISH ISLES, SHOWING THE EXTENT OF SEA WHICH WOULD BECOME LAND IF THERE WERE A GENERAL RISE OF THE AREA TO THE EXTENT OF 600 FEET. The darker shade expresses what is now land, the lighter shade the sj intervening between the present coast line and the 100 fathom line, wl would be converted by such a movement into land. 280 REVOLUTIONS IN PHYSICAL GEOGRAPHY. CHAP. XIT. the miocene period, like Madeira, Porto Santo, and the Desertas, constituting the small Madeiran Archipelago, we might have expected to discover a difference in the species of land-shells, not only when Ireland was compared to Eng land, but when different islands of the Hebrides were con trasted one with another, and each of them with England. It would not, however, be necessary, in order to effect the complete fusion of the animals and plants which we witness, to assume that all parts of the area formed continuous land at one and the same moment of time, but merely that the several portions were so joined within the post-pliocene era as to allow the animals and plants to migrate freely in succession from one district to another. Southernmost Extent of Erratics in England. In reference to that portion of the south of England which is marked by diagonal lines in the map at p. 260, the theory of its having been an area of dry land during the period of great submergence and floating-ice does not depend merely on negative evidence, such as the absence of the northern drift or boulder clay on its surface ; but we have also, in favour of the same conclusion, the remarkable fact of the presence of erratic blocks on the southern coast of Sussex, implying the existence there of an ancient coast-line at a period when the cold must have been at its height. These blocks are to be seen in greatest number at Pagham and Selsea, fifteen miles south of Chichester, in lat. 5040'N. They consist of fragments of granite, syenite, and green stone, as well as of Devonian and Silurian rocks, some of them of large size. I measured one of granite at Pagham, twenty-seven feet in circumference. They are not of nor thern origin, but must have come from the coast of Nor- CHAP. xiv. ERRATICS IN SUSSEX. 281 mandy or Brittany, from land which may. once have existed to the south-west, in what is now the English Channel. They were probably drifted into their present site by coast ice, and the yellow clay and gravel in which they are em bedded are a littoral formation, as shown by the shells. Beneath the gravel containing these large erratics, is a blue mud in which skeletons of Elephas antiquus, and other mammalia, have been observed. Still lower occurs a sandy loam, from which Mr. E. Gr. Austen* has collected thirty- eight species of marine shells, all recent, but forming an assemblage differing as a whole from that now inhabiting the English Channel. The presence among them of Lutraria rugosa and Pecten polymorphus, not known to range farther north in the actual seas than the coast of Portugal, indicates a somewhat warmer temperature at the time when they flourished. Subsequently, there must have been great cold when the Selsea erratics were drifted" into their present position, and this cold doubtless coincided in time with a low temperature farther north. These transported rocks of Sussex are somewhat older than a sea-beach with recent marine shells which at Brighton is covered by chalk rubble, called the ( elephant-bed,' which I cannot describe in this place, but allude to it as one of many geological proofs of the former existence of a seashore in this region, and of ancient cliffs bounding the channel between France and England, all of older date than the close of the glacial period. In order to form a connected view of the most simple series of changes in physical geography which can possibly account for the phenomena of the glacial period, and the period of the establishment of the present provinces of animals and plants, the following geographical states of the British and adjoining areas may be enumerated. * Geological Quarterly Journal, TO!, xiii. p. 50. 282 PERIODS OF JUNCTION AND SEPARATION CHAP. xiv. First, a continental period, towards the close of which the forest of Cromer flourished (p. 214) : when the land was at least 500 feet above its present level, perhaps much higher, and its extent probably greater than that given in the map, fig. 41. Secondly, a period of submergence, by which the land north of the Thames and Bristol Channel, and that of Ireland, was gradually reduced to such an archipelago as is pictured in map, fig. 40 ; and finally to such a general prevalence of sea as is seen in map, fig. 39. This was the period of great submergence and of floating ice, when the Scandinavian flora, which occupied the lower grounds during the first continental period, may have obtained exclusive possession of the only lands not covered with perpetual snow. Thirdly, a second continental period when the bed of the glacial sea, with its marine shells and erratic blocks, was laid dry, and when the quantity of land equalled that of the first period, and therefore probably exceeded that represented in the map, p. 279. During this period there were glaciers in the higher mountains of Scotland and Wales, and the Welsh glaciers, as we have seen, pushed before them and cleared out the marine drift with which some valleys had been filled during the period of submergence. The parallel roads of Grlen Eoy are referable to some part of the same era. As a reason for presuming that the land which in map, fig. 41, p. 279, is only represented as 600 feet above its present level, was during part of this period much higher, Professor Ramsay has suggested that, as the previous depression far exceeded a hundred fathoms (amounting in Wales to 1,400 feet, as shown by marine shells, and to 2,300, by stratified drift), it is not improbable that the upward movement was on a corresponding scale. In passing from the period of chief submergence to this second continental condition of things, we may conceive a gradual change first from that of map 39 to map 40, then CHAP. xiv. OF ENGLAND, IRELAND, AND THE CONTINENT. 283 from the latter phase to that of map 41, and finally to still greater accessions of land. During this last period the passage of the Germanic flora into the British area took place, and the Scandinavian plants, together with northern insects, birds, and quadrupeds, retreated into the higher grounds. The first appearance of man, when, together with the mam moth and woolly rhinoceros, or with the Elephas antiquus, Rhinoceros liemitwchus, and Hippopotamus major, he ranged freely from all parts of the continent into the British area, belongs probably to a late portion of this second continental period. Fourthly, the next and last change comprised the break ing up of the land of the British area once more into nu merous islands, ending in the present geographical condition of things. There were probably many oscillations of level during this last conversion of continuous land into islands, and such movements in opposite directions would account for the occurrence of marine shells at moderate heights above the level of the sea, notwithstanding a general lowering of the land. To the close of this era belong the marine deposits of the Clyde and the Carses of the Tay and Forth, before alluded to, pp. 47, 51, 54. In a memoir by Professor E. Forbes, before cited, he observes, that the land of passage by which the plants and animals migrated into Ireland consisted of the upraised marine drift which had previously formed the bottom of the glacial sea. Portions of this drift extend to the eastern shores of Wicklow and Wexford, others are found in the Isle of Man full of arctic shells, others on the British coast opposite Ireland. The freshwater marl, containing numerous skeletons of the great deer, or Megaceros, overlie in the Isle of Man that marine glacial drift. Professor Forbes also remarks that the subsequent disjunction of Ireland from England, or the for mation of the St. George's Channel, which is less than 400 284 PEKIODS OF JUNCTION AND SEPARATION CHAP. xiv. feet in its greatest depth, preceded the opening of the Straits of Dover, or the final separation of England from the Conti nent. This he inferred from the present distribution of species both in the animal and vegetable kingdoms. Thus for example, there are twice as many reptiles in Belgium as in England, and the number inhabiting England is twice that found in Ireland. Yet the Irish species are all com mon to England, and all the English to Belgium. It is there fore assumed that the migration of species westward having been the work of time, there was not a sufficient lapse of ages to complete the fusion of the continental and British rep tilian fauna, before France was separated from England and England from Ireland. For the same reason there are also a great number of birds of short flight, and small quadrupeds, inhabiting England which do not cross to Ireland, the St. Greorge's Channel seeming to have arrested them in their westward course.* The depth of the St. Greorge's Channel in the narrower parts is only 360 feet, and the English Channel between Dover and Calais less than 200, and rarely anywhere more than 300 feet ; so that vertical movements of slight amount compared to some of those previously considered, with the aid of denuding operations or the waste of sea cliffs, and the scouring out of the channel, might in time effect the insulation of the lands above alluded to. Time required for successive Changes in Physical Geo graphy in the Post-Pliocene Period. The time which it would require to bring about such changes of level, according to the average rate assumed at p. 58, however vast, will not be found to exceed that which * E. Forbes, Fauna and Flora of British Isles ; Memoirs of Geological Survey, Tol. i. p. 344, 1846. CHAP. xiv. OF ENGLAND, IRELAND, AND THE CONTINENT. 285 would best explain the successive fluctuations in terrestrial temperature, the glaciation of solid rocks, the transpor tation of erratics above and below the sea level, the height of arctic shells above the sea, and last, not least, the migra tion of the existing species of animals and plants into their actual stations, and the extinction of some conspicuous forms which flourished during the post-pliocene ages. When we duly consider all these changes which have taken place since the beginning of the glacial epoch, or since the Forest of Cromer and the Elephas meridionalis flourished, we shall find that the phenomena become more and more intelligible in proportion to the slowness of the rate of elevation and depression which we assume. The submergence of Wales to the extent of 1,400 feet, as proved by glacial shells, would require 56,000 years, at the rate of 2 j- feet per century ; but taking Professor Eamsay's estimate of 800 feet more, as stated at p. 267, that elevation being required for the deposition of some of the stratified drift, we must demand an additional period of 32,000 years, amount ing in all to 88,000 ; and the same time would be required for the re-elevation of the tract to its present height. But if the land rose in the second continental period no more than 600 feet above the present level, as in map, p. 279, this 600 feet would have taken another 26,000 years ; the whole of the grand oscillation, comprising the submergence and re-emer gence, having taken, in round numbers, 180,000 years for its completion ; and this, even if there were no pause or stationary period, when the downward movement ceased, and before it was converted into an upward one. I am aware that it may be objected that the average rate here proposed is a purely arbitrary and conjectural one, because, at the North Cape, it is supposed that there has been a rise of about six feet in a century, and at Spitzbergen, according to Mr. Lamont, a still faster upheaval during the 286 TIME REQUIRED FOR CHANGES OF LEVEL, CHAP. xiv. last 400 years.* But, granting that in these and some ex ceptional cases (none of them as yet very well established) the rising or sinking has, for a time, been accelerated, I do not believe the average rate of motion to exceed that above proposed. Mr. Darwin, I find, considers that such a mean rate of upheaval would be as high as we could assume for the west coast of South America, where we have more evidence of sudden changes of level than anywhere else. He has not, however, attempted to estimate the probable rate of secular elevation in that or any other region. Little progress has yet been made in divining the most probable causes of these great movements of the earth's crust ; yet what little we know of the state of the interior leads us to expect that the gradual expansion or contraction of large portions of the solid crust may be the result of fluctuations in temperature, with which the existence of hundreds of active and thousands of extinct volcanoes is probably connected. It is ascertained that solid rocks, such as granite and sandstone, expand and contract annually, even under such a moderate range of temperature as that of a Canadian winter and summer. If the heat should go on increasing through a thickness, say only of ten miles of the earth's crust, the gradual upheaval . of the incumbent mass may amount to many hundreds of feet ; and the elevation may be carried still farther, by the complete fusion of part of the inferior rocks. According to the experiments of Deville, the contraction of granite, in passing from a melted, or as some would say its plastic condition, to a solid state, must be more than ten per cent.f So that we have at our command a source of depression on a grand scale, at every period when granitic * Seasons with the Sea-Horses, p. 202. f Bulletin de la Societe Greologique, 2nd series, vol. iv. p. 1312. CHAP. xiv. AND PROBABLE CAUSES OF MOVEMENTS. 287 rocks have originated in the interior of the earth's crust. All mineralogists are agreed that the passage of voluminous masses, from a liquid or pasty to a solid and crystalline state, must be an extremely slow process. It may often happen that, in the same series of superimposed rocks, some are expanding while still solid or while partially melting, while others are at the same time crystallising and contracting ; so that the alterations of level at the surface may be the result of complicated and often of conflicting agencies. The more gradually we conceive such changes to take place, the more comprehensible they become in the eyes of the chemist and natural philosopher who speculates on the changes of the earth's interior ; and the more fertile are they in the hands of the geologist in accounting for revolutions on the habitable surface. We may presume, that after the movement has gone on for a long time in one determinate direction, whether of eleva tion or depression, the change to an opposite movement, implying the substitution of a heating for a refrigerating operation, or the reverse, would not take place suddenly ; but would be marked by a period of inaction, or of slight move ment, or such a state of quiescence, as prevails throughout large areas of dry land in the normal condition of the globe. I see no reason for supposing that any part of the revo lutions in physical geography, to which the maps above described have reference, indicate any catastrophes greater than those which the present generation has witnessed. If man was in existence when the Cromer forest was becoming submerged, he would have felt no more alarm than the Danish settlers on the east coast of Baffin's Bay, when they found the poles, which they had driven into the beach to secure their boats, had subsided below their original level. Already, perhaps, the melting ice has thrown down till 288 CAUSES OF UPHEAVAL AND SUBSIDENCE. CHAP. xiv. and boulders upon those poles, a counterpart of the boulder clay which overlies the forest-bed on the Norfolk cliffs. We have seen that all the plants and shells, marine and freshwater, of the forest bed, and associated fluvio-marine strata of Norfolk, are specifically identical with those of the living European flora and fauna ; so that if upon such a stratum a deposit of the present period, whether freshwater or marine, should be thrown down, it might lie conformably over it, and contain the same invertebrate fauna and flora. The strata so superimposed would, in ordinary geological language, be called contemporaneous, not only as belonging to the same epoch, but as appertaining strictly to the same subdivision of one and the same epoch ; although they would in fact have been separated by an interval of several hundred thousand years. If, in the lower of the two formations, some of the mammalia of the genera elephant and rhinoceros were found to be distinct in species from those of the same genera in the upper or ' recent ' stratum, it might appear as though there had been a sudden coming in of new forms, and a sudden dying out of old ones; for there would not have been time in the interval for any perceptible change in the invertebrate fauna, by which alone we usually measure the lapse of time in the older formations. When we are contrasting the vertebrate contents of two sets of superimposed strata of the cretaceous, oolitic, or any other ancient formation in which the shells are identical in species, we ought never to lose sight of the possibility of their having been separated by such intervals or by two or three thousand centuries. That number of years may sometimes be of small moment in reference to the rate of fluctuation of species in the lower animals, but very important when the succession of forms in the highest classes of vertebrata is concerned. CHAP. xiv. MAN'S AGE IN EELATION TO PRESENT FAUNA. 289 If we reflect on the long series of events of the post- pliocene and recent periods contemplated in this chapter, it will be remarked that the time assigned to the first appear ance of man, so far as our geological inquiries have yet gone, is extremely modern in relation to the age of the existing fauna and flora, or even to the time when most of the living species of animals and plants attained their actual geographical distribution. At the same time it will also be seen, that if the advent of man in Europe occurred before the close of the second continental period, and antecedently to the se paration of Ireland from England and of England from the continent, the event would be sufficiently remote to cause the historical period to appear quite insignificant in duration, when compared to the antiquity of the human race. ;290 EXTINCT GLACIERS OF SWITZERLAND. CHAP. xv. CHAPTEE XV. EXTINCT GLACIERS OF THE ALPS AND THEIR CHRONOLOGICAL RELATION TO THE HUMAN PERIOD. EXTINCT GLACD3RS OF SWITZERLAND ALPINE ERRATIC BLOCKS ON THE JURA NOT TRANSPORTED BY FLOATING ICE EXTINCT GLACIERS OF THE ITALIAN SIDE OF THE ALPS THEORY OF THE ORIGIN OF LAKE-BASINS BY THE EROSIVE ACTION OF GLACIERS, CONSIDERED SUCCESSIVE PHASES IN THE DEVELOPMENT OF GLACIAL ACTION IN THE ALPS PROBABLE RELATION OF THESE TO THE EARLIEST KNOWN DATE OF MAN CORRESPONDENCE OF THE SAME WITH SUCCESSIVE CHANGES IN THE GLACIAL CONDITION OF THE SCANDINAVIAN AND BRITISH MOUN TAINS COLD PERIOD IN SICILY AND SYRIA. Extinct Glaciers of Switzerland. WE have seen in the preceding chapters that the mountains of Scandinavia, Scotland, and North Wales have served, during the glacial period, as so many independent centres for the dispersion of erratic blocks, just as at present the ice- covered continent of North Greenland is sending down ice in all directions to the coast, and filling Baffin's Bay with floating bergs, many of them laden with fragments of rocks. Another great European centre of ice-action during the post- pliocene period was the Alps of Switzerland, and I shall now proceed to consider the chronological relations of the extinct Alpine glaciers to those of more northern countries pre viously treated of. The Alps lie far south of the limits of the northern drift described in the foregoing pages, being situated between the 44th and 47th degrees of north latitude. On the flanks of these mountains, and on the sub Alpine ranges of hills or CHAP. XV. THEIR GREAT EXTENT. 291 plains adjoining them, those appearances which have been so often alluded to, as distinguishing or accompanying the drift, between the 50th and 70th parallels of north latitude, suddenly reappear and assume, in a southern region, a truly arctic development. Where the Alps are highest, the largest erratic blocks have been sent forth; as, for example, from the regions of Mont Blanc and Monte Rosa, into the adjoin ing parts of Switzerland and Italy ; while in districts where the great chain sinks in altitude, as in Carinthia, Carniola, and elsewhere, no such rocky fragments, or a few only and of smaller bulk, have been detached and transported to a distance. In the year 1821, M. Venetz first announced his opinion that the Alpine glaciers must formerly have extended far beyond their present limits, and the proofs appealed to by him in confirmation of this doctrine were afterwards ac knowledged by M. Charpentier, who strengthened them by new observations and arguments, and declared, in 1836, his conviction that the glaciers of the Alps must once have reached as far as the Jura, and have carried thither their moraines across the great valley of Switzerland. M. Agassiz, after several excursions in the Alps with M. Charpentier, and after devoting himself some years to the study of glaciers, published, in 1840, an admirable description of them and of the marks which attest the former action of great masses of ice over the entire surface of the Alps and the surrounding country.* He pointed out that the surface of every large glacier is strewed over with gravel and stones detached from the surrounding precipices by frost, rain, lightning, or ava lanches. And he described more carefully than preceding writers the long lines of these stones, which settle on the sides of the glacier, and are called the lateral moraines ; those * Agassiz, Etudes sur les Glaciers et Systeme Grlaciaire. u 2 292 OSCILLATIONS OF ALPINE GLACIERS. CHAP. xv. found at the lower end of the ice being called terminal moraines. Such heaps of earth and boulders every glacier pushes before it when advancing, and leaves behind it when retreating. When the Alpine glacier reaches a lower and a warmer situation, about 3,000 or 4,000 feet above the sea, it melts so rapidly that, in spite of the downward movement of the mass, it can advance no farther. Its precise limits are variable from year to year, and still more so from century to century ; one example being on record of a recession of half a mile in a single year. We also learn from M. Venetz, that whereas, between the eleventh and fifteenth centuries, all the Alpine glaciers were less advanced than now, they began in the seventeenth and eighteenth centuries to push forward, so as to cover roads formerly open, and to overwhelm forests of ancient growth. These oscillations enable the geologist to note the marks which a glacier leaves behind it as it retrogrades ; and among these the most prominent, as before stated, are the terminal moraines, or mounds of unstratified earth and stones, often divided by subsequent floods into hillocks, which cross the valley like ancient earth-works, or embankments made to dam up a river. Some of these transverse barriers were formerly pointed out by Saussure below the glacier of the Rhone, as proving how far it had once transgressed its present boundaries. On these moraines we see many large angular fragments, which, having been carried along the surface of the ice, have not had their edges worn off by friction ; but the greater number of the boulders, even those of large size, have been well rounded, not by the power of water, but by the mechanical force of the ice, which has pushed them against each other, or against the rocks flanking the valley. Others have fallen down the numerous fissures which intersect the glacier, where, being subject to the pressure of the whole mass of ice, they have been forced along, and either well CHAP. xv. MOEAINES AND GLACIAL FURROWS. 293 rounded or ground down into sand, or even the finest mud, of which the moraine is largely constituted. As the terminal moraines are the most prominent of all the monuments left by a receding glacier, so are they the most liable to obliteration ; for violent floods or debacles are some times occasioned in the Alps by the sudden bursting of glacier-lakes, or those temporary sheets of water before al luded to, which are caused by the damming up of a river by a glacier which has increased during a succession of cold seasons, and descending from a tributary into the main valley, has crossed it from side to side. On the failure of this icy barrier, the accumulated waters, being let loose, sweep away and level many a transverse mound of gravel and loose boulders below, and spread their materials in confused and irregular beds over the river-plain. Another mark of the former action of glaciers, in situa tions where they exist no longer, is the polished, striated, and grooved surfaces of rocks before described. Stones which lie underneath the glacier and are pushed along by it, sometimes adhere to the ice, and as the mass glides slowly along at the rate of a few inches, or at the utmost two or three feet, per day, abrade, groove, and polish the rock, and the larger blocks are reciprocally grooved and polished by the rock on their lower sides. As the forces both of pressure and propul sion are enormous, the sand, acting like emery, polishes the surface ; the pebbles, like coarse gravers, scratch and furrow it ; and the large stones scoop out grooves in it. Lastly, pro jecting eminences of rock, called 'roches moutonnees' (see above, p. 269), are smoothed and worn into the shape of flattened domes where the glaciers have passed over them. Although the surface of almost every kind of rock, when exposed to the open air, wastes away by decomposition, yet some retain for ages their polished and furrowed exterior : and, if they are well protected by a covering of clay or turf, 294 ALPINE ERRATICS ON THE JURA. CHAP. xv. these marks of abrasion seem capable of enduring for ever. They have been traced in the Alps to great heights above the present glaciers, and to great horizontal distances beyond them. Another effect of a glacier is to lodge a ring of stones round the summit of a conical peak which may happen to project through the ice. If the glacier is lowered greatly by melting, these circles of large angular fragments, which are called ' perched blocks,' are left in a singular situation near the top of a steep hill or pinnacle, the lower parts of which may be destitute of boulders. Alpine erratic Blocks on the Jura. Now some or all the marks above enumerated, the mo raines, erratics, polished surfaces, domes, striae, and perched rocks are observed in the Alps at great heights above the present glaciers, and far below their actual extremities; also in the great valley of Switzerland, fifty miles broad ; and almost everywhere on the Jura, a chain which lies to the north of this valley. The average height of the Jura is about one- third that of the Alps, and it is now entirely destitute of glaciers; yet it presents almost everywhere moraines, and polished and grooved surfaces of rocks. The erratics, more over, which cover it present a phenomenon which has as tonished and perplexed the geologist for more than half a century. No conclusion can be more incontestable than that these angular blocks of granite, gneiss, and other crystalline formations, came from the Alps, and that they have been brought for a distance of fifty miles and upwards across one of the widest and deepest valleys of the world ; so that they are now lodged on the hills and valleys of a chain composed of limestone and other formations, altogether distinct from those of the Alps. Their great size and angularity, after a journey CHAP. xv. GREAT ICE-SHEET OF SWITZERLAND. 295 of so many leagues, has justly excited wonder, for hundreds of them are as large as cottages ; and one in particular, com posed of gneiss, celebrated under the name of Pierre a Bot, rests on the side of a hill about 900 feet above the lake of Neufchatel, and is no less than forty feet in diameter. But there are some far-transported masses of granite and gneiss which are still larger, and which have been found to contain 50,000 and 60,000 cubic feet of stone ; and one limestone block at Devens, near Bex, which has travelled thirty miles, contains 161,000 cubic feet, its angles being sharp and unworn. Von Buch, Escher, and Studer inferred, from an exami nation of the mineral composition of the boulders, that those resting on the Jura, opposite the lakes of Greneva and Neuf- chatel, have come from the region of Mont Blanc and the Valais, as if they had followed the course of the Bhone, to the lake of Greneva, and had then pursued their way uninter ruptedly in a northerly direction. M. Charpentier, who conceived the Alps in the period of greatest cold to have been higher by several thousand feet than they are now, had already suggested that the Alpine glaciers once reached continuously to the Jura, conveying thither the large erratics in question.* M. Agassiz, on the other hand, instead of introducing distinct and separate glaciers, imagined that the whole valley of Switzerland might have been filled with ice, and that one great sheet of it ex tended from the Alps to the Jura, the two chains being of the same height as now relatively to each other. To this idea it was objected that the difference of altitude, when distributed over a space of 50 miles, would give an inclination of two degrees only, or far less than that of any known glacier. In spite of this difficulty, the hypothesis has since received the support of Professor James Forbes, in his very able work on the Alps, published in 1843. * D'Arduac, Histoire des Progress, &c. torn. ii. p. 249. 296 GLACIERS OF CHILIAN ANDES. CHAP. xv. In 1841, I advanced, jointly with Mr. Darwin,* the theory that the erratics may have been transferred by floating ice to the Jura, at the time when the greater part of that chain, and the whole of the Swiss valley to the south, was under the sea. We pointed out, that if at that period the Alps had attained only half their present altitude, they would yet have con stituted a chain as lofty as the Chilian Andes, which, in a latitude corresponding to Switzerland, now send down glaciers to the head of every sound, from which icebergs, covered with blocks of granite, are floated seaward. Opposite that part of Chili where the glaciers abound, is situated the island of Chiloe, one hundred miles in length, with a breadth of thirty miles, running parallel to the continent. The channel which separates it from the main land is of considerable depth, and twenty-five miles broad. Parts of its surface, like the adja cent coast of Chili, are overspread with recent marine shells, showing an upheaval of the land during a very modern period ; and beneath these shells is a boulder deposit, in which Mr. Darwin found large blocks of granite and syenite, which had evidently come from the Andes. A continuance in future of the elevatory movement, now observed to be going on in this region of the Andes and of Chiloe, might cause the former chain to rival the Alps in altitude, and give to Chiloe a height equal to that of the Jura. The same rise might dry up the channel between Chiloe and the main land, so that it would then represent the great valley of Switzerland. Sir Koderick I. Murchison, after making several impor tant geological surveys of the Alps, proposed, in 1849, a theory agreeing essentially with that suggested by Mr. Dar win and myself, viz. that the erratics were transported to the Jura, at a time when the great strath of Switzerland, and * See Elements of Geology, 2nd ed. 1841. CHAP. XV. THEORIES OF CHARPENTIER AND GUYOT. 297 many valleys receding far into the Alps, were under water. He thought it impossible that the glacial detritus of the Rhone could ever have been carried to the Lake of Geneva, and beyond it by a glacier, or that so vast a body of ice issuing from one narrow valley could have spread its erratics over the low country of the Cantons of Vaud, Friburg, Berne, and Soleure, as well as the slopes of the Jura, comprising a region of about a hundred miles in breadth from south-west to north-east, as laid down in the map of Charpentier. He therefore imagined the granitic blocks to have been trans lated to the Jura by ice- floats when the intermediate country was submerged.* It may be remarked that this theory, pro vided the water be assumed to have been salt or brackish, demands quite as great an oscillation in the level of the land as that on which Charpentier had speculated, the only differ ence being that the one hypothesis requires us to begin with a subsidence of 2,500 or 3,000 feet, and the other, with an elevation to the same amount. We should also remember that the crests or watersheds of the Alps and Jura are about eighty miles apart, and if once we suppose them to have been in movement during the glacial period, it is very probable that the movements at such a distance may not have been strictly uniform. If so, the Alps may have been relatively somewhat higher, which would greatly have facilitated the extension of Alpine glaciers to the flanks of the less elevated chain. Five years before the publication of the memoir last men tioned, M. Oruyot had brought forward a great body of new facts in support of the original doctrine of Charpentier, that the Alpine glaciers once reached as far as the Jura, and that they had deposited thereon a portion of their moraines.f The scope of his observations and argument was laid with * Quarterly Geological Journal, f Bulletin de la Societe des Sciences 1850, vol. vi. p. 65. Naturelles de Neufchatel, 1845. 298 ORDERLY DISTRIBUTION OF ALPINE ERRATICS. CHAF. xv. great clearness before the British public in 1852 by Mr. Charles Maclaren, who had himself visited Switzerland for the sake of forming an independent opinion on a theoretical question of so much interest, and on which so many eminent men of science had come to such opposite conclusions.* M. Gruyot had endeavoured to show that the Alpine erratics, instead of being scattered at random over the Jura and the great plain of Switzerland, are arranged in a certain deter minate order, strictly analogous to that which ought to prevail if they had once constituted the lateral, medial, and terminal moraines of great glaciers. The rocks chiefly relied on as evidence of this distribution consist of three varieties of granite, besides gneiss, chlorite-slate, euphotide, serpentine, and a peculiar kind of conglomerate, all of them mineral compounds, foreign alike to the great strath between the Alps and Jura, and to the structure of the Jura itself. In these two regions, limestones, sandstones, and clays of the secondary and tertiary formations alone crop out at the surface, so that the travelled fragments of Alpine origin can easily be distinguished, and in some cases the precise localities pointed out from whence they must have come. The accompanying map or diagram, slightly altered from one given by Mr. Maclaren, will enable the reader more fully to appreciate the line of argument relied on by M. Gruyot. The dotted area is that over which the Alpine fragments were spread by the supposed extinct glacier of the Khone. The site of the present reduced glacier of that name is shown at A. From that point, the boulders may first be traced to B, or Martigny, where the valley takes an abrupt turn at right angles to its former course. Here the blocks belonging to the right side of the river, or derived from c, d, e, have not crossed over to the left side at B, as they should * Edinburgh. New Philosophical Magazine, October 1852. CHAP. xv. MAP OF EXTINCT GLACIER OF THE RHONE. 299 have done had they been transported by floating ice, but continue to keep to the side to which they belonged, assum- Fig. 42 MAP SHOWING THE SUPPOSED COURSE OF THE ANCIENT AND NOW EX TINCT GLACIER OF THE RHONE, AND THE DISTRIBUTION OF THE ERRATIC BLOCKS AND DRIFT CONVEYED BY IT TO THE GREAT VALLEY OF SWITZERLAND AND THE JURA. ing that they once formed part of a right lateral moraine of a great extinct glacier. That glacier, after arriving at the lower end of the long narrow valley of the upper Khone at F, filled the lake of Geneva, F, I, with ice. From F, as from a great vomitory, it then radiated in all directions, bearing along with it the moraines with which it was loaded, and spreading them out on all sides over the great plain. But 300 DIRECTION TAKEN BY THE ERRATICS, CHAP. xv. the principal icy mass moved straight onwards in a direct line towards the hill of Chasseron, G (precisely opposite F), where the Alpine erratics attain their maximum of height on the Jura, that is to say, 2,015 English feet above the level of the Lake of Neufchatel, or 3,450 feet above the sea. The granite blocks which have ascended to this eminence G, came from the east shoulder of Mont Blanc, A, having travelled in the direction B, F, G. When these and the accompanying blocks resting on the south-eastern declivity of the Jura are traced from their culminating point a, in opposite directions, whether westward towards Geneva, or eastwards towards Soleure, they are found to decline in height from the middle of the arc G, towards the two extremities I an