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Tous les autres exemplaires originaux sont filmds en commenpant par la premidre page qui comporte une empreinte d'impression ou d'iliustration et en terrninant par la dernidre page qui comporte une telle empreinte. The last recorded frame on each microfiche shall contain the symbol —^ (meaning "CON- TINUED "), or the symbol V (meaning "END"), whichever applies. Un des symboles suivants apparaitra sur la dernidre image de chaque microfiche, selon le cas: le symbole — ^ signifie "A SUIVRE", le symbole V signifie "FIN". Maps, plates, charts, etc., may be filmed at different reduction ratios. Those too large to be entirely included in one exposure are filmed beginning in the upper left hand corner, left to right and top to bottom, as many frames as required. The following diagrams illustrate the method: Les cartes, planches, tableaux, etc., peuvent dtre film^s d des taux de reduction diff^rents. Lorsque le document est trop grand pour dtre reproduit en un seul cliche, il est filmd d partir de Tangle supdrieur gauche, de gauche d droite, et de haut en bas, en prenant le nombre d'images n6cessaire. Les diagrammes suivants illustrent la m^thode. 1 2 3 1 2 3 4 5 6 H Section IV , 1886. 139 Trans. Roy. Soc. Canada. XII. — Notes on (fie Limestones of East Rioer, Piciou, N.S. / By Edwin GiiiPiN, JuN., A.M., F.CJ-.S. (Kciid May 1.'7, 18Sr..) Tho followiug analyse.'* ol' limestoueN, Irom the Iwowor Carboniferous Marine Limestone series of Piciou County were made some years ago by the writer, when engaged in an investigation into the subject of fluxes lor the extensive deposits of iron ore which charititerize this district, and they may be appropriately prefaced l>y a few remarks on the extent and distriltution of the Lower Carl)oniferous measures of East liivcr. The general arrangement of the subdivisions of the Carboniferous system in this county can be readily recognized, and is given in suliicient detail in Sir W. Dawson's " Acadian Ceology." It maybe remarked that, in the district more particularly referred to in these notes, viz., that extending from (ilengarry, on the Interc.olonial Kailway, to McLellan's Mountain, the Lower Coal formation does not appear, and may be represented on the eastern edge of the district by the conglomerate beds of Irish Mountain and McLellan's Brook. On liig Brook, a tributary of West Branch, about four miles above Hopewell, are met limestones and gypsum with red shale and Haggy sandstones, resting on Siluro-Cambrian measures, and dipping to the north. These limestones are exposed on the West Braui b and can he. trai'cd south ol" Grant's Laki' to tlie valley of l']ast River. They are associated with red shales, and red and gray sandstones, and tlie measures are broken through by several masses of the dioritic trap, probably contemporaneous. Exposures of gypsum are not met until near the mouth of Anhibald's Brook. Here a compact, blue limestone, about thirty feet thick, is overlaid by marl, and by an immense mass of gypsum, about 100 feet in thickness. It is impure in (juality, and contains layers of marl unil siliceous matter. In the upper part, are layers of granular and librous, red gipsum. Above this come beds of hard, red. shale, hiiving a general dip to the west. The course of the gyi>sum, as marked by funnel-.>iiil (ipi)(i.>it(' the lilurl; Umk, urc luft lirncstoiii's i iirryiiii^ liinonitc. Tho hcJoi' tlu' river, ami the narrow valley IVom this point ior some distuneo south oT Sunny Brae, are occupied liy linie.stone beds (No. 1),' the principal exposures oi' whith show a liard, coinpaet rock, ol' grey and hluish colors, in places arenaceous or marly. Hetiu-ning' along- the east bank ol' the river, on (". Mai Donald's I'arm, i.s a compact, bluish limestone, holdinu' rounded pebbles of the slaty breicia. Still i'urther noiih. at Bridgeville, opposite the large exposun' of gypsum, already alluded to. trial pits showed limonite, hilinu' the junper Silurian slates, stained with patches of peroxide of iron, and liilcd with seams holdiui;- red and white (piart/ and cahspar, strike S. 75° E., and dip heavily to the north. Hesting on them is a breccia of fragments of the elates. On the side next th<' older roik, the calcareous eement can hardly be distin- Pfuished, but at a distance of six inches, the slate fragments grow scattered and are united by dark-grey limestone, which quii-kly predominates to the excl .ision of the slate. The limestone (No. 3), .'is exposed, is about fifty feet thick, but its normal dimensions are much greater. Immediately overlying the limestone is a wide out overlying beds are coarser, in quality, with layers of soft, white gypsum. Above the gypsum ami marls are (>xposures of red and gray shales with limestones, giving in all a section of about 450 feet. The beds dip a little to the west of north, with an inclination which is heavy near the older rocks, but gradually diminishes toward the upper part of the section. IJelurning toward S[)ring\ille, at L. McLean's are met several thick binls of limestone (No. 4) dipping to the west of luirlh. and overlying the gypsum, probably about 200 feet, the interval beim>- occupii^d by red shales and marls. .'\t the East IJiver llridge, near Springville, al)ont on the line of McLean's limestone beds, ar(> numerous exposures of compact, gray and l)lue limestone, sometimes ariiillaceous, succeeded by red and gray sandstones, with soft argillaceous shales and marls. The nuiubeia given in tlie text ciirniHixniil tu liiose of tlie ivnalyseH, and to those marked on the sketuh map. OF KAST RlVHIf, riCTOU, N.S. 161 The geiu'ial relations of these strata may l)e gathered from the following section, from a survey of the East River, below Springville, niadt; by me some years ago : — Black, bituminous, iironaruous slialo I!lac){, l)itiiiiiiium!s liiiiostdiie • Iliinl-lilui! 11 iin'.-t 1)110, witli iirenaeooua bamla Very lianl, rompacl, blue limestone Soft, laiiiinatdd, caluaroims shale ]l!ue limestone Sof'l, liiniiiialtMl, drab Nbale liliie, artfillaceons liiuestone Caleareous, urcillawous sbale, joints filled with calfspar and lluorspar Gray, ar(.'iIla :t 2 .-. 2 2 a 1 (1 1 4 • > 2 >> 10 (1 <> i:i <) (t 1 2 !t 1 4 ] 11 111 (1 (I 11 1 3 5 4 4 5 5 i) 1 4 4 2 4 1 li 25 • » 10 i> 1) Total ISti 11 Other sections show alternations of red and i^ray (•ompa. C>.) arn apparently, about the middle of this fonnatioii, and may In- parallok'd with tho Forbi's, MrLellan and Kobi'ilison limfstoucs (7, 8, !»)■ On the West Brumh, a sliort dislam i' abuvc thi' forks, is a limited exposure of gypsuuj, which is associated with gray areiiaicous liiiiotuiic, and a .-series of thii k bedded sand- stones, holding Caleopyrite easts of plant remains. Similar limestones are met on the extension of the strike of these measures to tho East liruncii, and .•• bed ol limestone (No. 10) several feet thick, composed of minute fragments of fossils, which give a rough pumice- like surface on weatiiering. This is, pmbiibly, the limestone referred for comparison with one of the same rock from Windsor. The analyses which I submit of East Kiver limestones, were made by me sometime ago, when engaged in an enquiry into the question of iluxes for the extensive iron ore deposits of the district, some of which have been incidentally alluded to iu my remarks. OP BAST mVFAl, PICTOU, N.S. 163 They are of samples selected principally from bods considered important I'rom their extent or convenience to transportation facilities. Their value is merely that of their being the first attempt at reprc8entin<>- the composition of this mineral over a considerable tract of ground in Nova Scoliii ; and the point wliich is brought o'lt, is of their comparatively non- magncsian character, except in the case of some of the lowest beds. They are arranged in ascending order, and their numbers correspond with those marked on the accompanying sketch map : — (1.) StTNNY Brak Limestone. — Color bluish, with seams of white and brownish calcspar, and oc^casional coarse grains of siliceous matter. Some parts of the deposit show obscure fossil marks. Moisture •0.")0 Limo ( 'iirbimato 8.') • 707 Miicnesiii (Carbonate 3"155 Iron carlxinnto 1'167 Iron Siilpliiile ■(•05 Pli78 L'(IH12 triiro Mir,.-) •510 •737 •108 •lil8 1-Sj(i 3-OHL' 100-088 (4.) McLean Limestone. — Compact gray limestone, with abundant fossil coral markings. r Composition. Moisture Linio carbonate Magnesia carbonate. . Iron jioroxido Mangunose peroxide. Alumina Sulphur I'liosplioric acid Sili('a Total. 99 -00 Sample A. Samplh n. ■18 •17 93-90 90-20 2--ir, 2-33 -59 •57 ■50 .55 -12 -10 -03 .02 -03 .03 2-10 1.99 102-02 Analyst, Durham College of Science. OP KAST RIVKT?, PirTOU, N.S. 165 (5.) QuAunY LiMEHTONK. — Flivggy, ivrgillait'oUH liint'stoue, «lnib rolour, with fow crystals of iron pyrites, iiiul ahiindiiiit fossils. MoiHtiim -66 Liino carbonuUt 43-12 Ma^'iicMiu rarl)oiiato 2'0II Iron ini'lniiiutit 4'10 Maii);aiu<8e {icMiixido l!'5ri Hiil|>liur I'liriHplioric acid Iiisiiliiblo rortiiltio, silicatu of aluininu, uml u littlo ttantl 47*00 TOTAI itiJ-H!) (6.) Grant Limestone. — Compact, grayiBh-hiuo, rough, red-weathoring limestone, with veinlets of white iron and calcspar, and a few crystals of iron pyrites ; abundant, obscure, fossil markings. Moiature 1 .110 Lime carbonuto !lO-(i(10 Mannosia oaiboiialc L'-;500 Iron rarbonute 2 • 280 Manganose Alumina 615 Iron 8ul])liide -(KM) Phogplioric acid '125 Insoluble residue 2-000 t Total. »^-dO (•7.) Forbes Limestone. — Dark, earthy blue, rough limestone, -with veinlets oi wniK and brown ferruginous spar, and crystals of dogtooth spar, and grains of siliceous matter; no visible fossils. MoLsturo -124 Limo carbonate 80-600 Magnesia carl>onato 1-500 Iron i)croxido 1 .roq Manganese jKiroxido. . j ^ ' Iron carbonate 1-550 Iron sulpiudc -225 riiosphoric acid -055 Insoluble residue 5-743 ToTAi 00-44(J (8.) McLellan Limestone. — Compact, dark blue limestone, with numerous broken fossils ; little visible pyrites. Moisture - — — Lime carbonate 87-437 Magnesia cartionatw 1-417 Manganese |)eroxido -301 Iron jxjroxido 2-330 Iron snlpliide 2-150 Pliosplioric acid trace. Carbonaceous matter -110 Insoluble residue 4-1 20 ToTAi 07-874 166 HDWIN GILPIN ON LIMESTONHS (0.) RoHKUTsoN Limestone. — Dark, earthy blue, compact, argillaceous limcstoius with numerous foHsils ami a lew small crystals of silica and iron pyrites. Moisturo lM5t) Lime carlionatc 78:!44 Mn^tiioHia I'arl lonale traco. Iron tarljiimito 2''22i Mantrancso oarbdiiato 4'-Mr) Iron Huljjliide ■4Hl' Phtv loric acid 'fXH Insoliihlo residue IMIOO ToT.M !i&115 (10.) Forks Limestone. — Compact, hluish-black limestone, with crystals of calcspar and spots of arenaceous matter. Moisturo "330 Liiiio iarl)onatc 7!)'130 Maguosia carlxmate 2'1S5 Iron carbonate 5'()19 Alanganeso oxide trace. Alumina "-lOS Iron sulphide '754 riiospliorio acid '403 Insoluble residue 11 "302 ToTAi 100-308 (11.) SHKTiL Limestone.— The following are analyses of the "shell" limestone from Brookfield and Windsor, referred to in these notes : — C'oMrosmoN. Lime carl Minute. . •■ Magnesia carbonate Oxide of iron Piiospliorlfi acid Insolidilo n^sidiic. .. - Total. liHOOKIIKI.D. WiNDSOH. I. II. 7-39 98-844 •94 •39fi 2-70* 2-ono* trace. 10103 trace. 101-240 97-04 1-10 -07 t rai-e. -(IS 99.49 ■* t'ontaininj' alumina. These limestones, which can be compared most aptly to a heap of recently opened and cleaned shells thrown together, are notable for their freedom from phosphorus, sialphixr, etc., and are apparently little beyond pure carbonate of lime, the iron oxide and alumina being carried in mechanically by water from the overlying clays. runs, k S. C. i«86. (IKOLOGICAl. MAI' Sec. IV. Plate XI CARBONIFEROUS MARINE LIMESTONE FORMATION AT EAST RIVER PICTOU CO. NS TO ILLUSTRATE MR E. GILPIN. JUN.s PAPER. (, b ;? i 3 f £ '-? Cl. V mr':^ Total. -~^ K 'iiip ^*«»,