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Les diagrammes suivants tiluatrant la mithode. 1 2 3 4 5 6 Htiiiiih'lHI ill I < I it i "ill I ) III ii> ii' ^iltljir ' >ilill}|j.!ji|iiil'i i>!l!lt) Ii m 11 ijhiii: , • iiiiilliill iiiililii" i Piii:i;|i!!ii|!i|ll biiiiiif i /p I ON THE SEQUENCE OF STRATA FORMING THE QUEBEC GROl\ OF LOGAN AND BHJJNGS, WITH REMARKS ON THE FOSSIL REMAINS FOUND THEREIN. By Henry xM. Ami, M.A., F.G.S., &c., nf the Geological Survey. \( Presented to the Royal Society of Canada by Dr. G. M. Dawson, F.R.S. &€., May, i8qi. ) ^^ '':2^WV- .< i I 5H!'' I!i!t;!: (KtDriiUed from iIk' O it.wva Na-hkalist, June i?aj:-.] OX THK SEQUENCE OF STRATA FORMING IHE QUEBEC GROUP OF LOGAN AND lilLLINGS, WITH REMARKS ON 'IHE FOSSIE REMAINS FOUND THEREIN. I'.y IFLMiry M. Ami, M.A., F.t...S., &.r., of the (ieoldj^ical Survey. (Presented to the Royal Society of Canada by Dr. (J. M. Jhiicsoii. F.K.S. &c., May, iSqi.) (.\bstract.) The pnper dealt with the Geological facts and grounds upon which the Quebec group rested and made it a necessary term in the geological nomenclature of strata in North America, but es|)ecially in the Province of Quebec. The grounds, upon which the separation of the various terranes constituting this .latural group was based, as well as the faunal and physical relations of its different members, were pointed out, showing the validity of the existence of such a series of fossihferous sedimentary strata as that which Sir William Logan had tecogni^.-d and Mr. Billings so clearly demonstrated early in the ''sixties." The removal ot the so-called Hudson River black graptolitic series of shales, etc., which are met with at Quebec City, at the we.st end of the Island of Orleans, along the Marsouin Ri\^r, and at many other places in the Province of Quebec-at Norman's Kiln, in the State of New York, and in Penobscot County, Maine, and other places in the United States — from an upjjermost pjsition in the Ordovician System — immediately above the Utica, or just below the base of the Silurian System — was absolutely necessary in tlie light of facts whether pala;ontological or stratigraphical or in the light of er physical reasons. The characteristics of this so-called " Hudson River ■' series of rocks, when studied in the field us well as in closer detail, point clearly to its intimate relation and association with the " Levis " of Sir William Logan's Quebec group. The Levis and the Quebec formations or terranes along with the Si/iery, form a group of terranes geologically and geographically closely related, which can be divided and sub-divided An 111 many iiistinres into dt-finite zones or horizons and smaller sub- divisions, all of which were dep. sited under peculiar conditions such as rharacterised the lower half of the Ordovician (Cambro-Siiurian) l-:poch in geolof^y. ^ It will tluisapi)ear that the rocks cmstitutin,,' the Quebec tcrrane (which term has bjen used and is bjin- adopted by many American Keolo-ists as a [in.per one wiih which to designate these so caUed "Hudson River ^' rocks) foim part and panel of the orii;inal " (Juehec droup" of I.o-an. The 1 aper went on to refer to the fuinas cntomhed in each of these three divisions, care btin;,^ taken to exclude fn.m the list of characteristic species— such f)rms as were not found in situ or from the rocks proper u{ each series -whether fn.m loose pieces or from conglomerates or conglomerate like hands, in order that the possibilities of error in correlation as well as in pahu ontological or faunal differenti- ation might he lessuied in the problem which like the present one affords such diversiiy of relati ms ami c implicated terms. The i)a])er is. in (act, a seiiuel to the writer's contribution read before the (leological Society of America at Washington, last December and published since. (See Bulletin of the Geolooical Society of Ani'^nca, Vol. II.. pp. 477-502, plate 20. iS,;,.) Whilst the laiter dealt more l)articular!y with the region about (Quebec City-lhe present one referred to the relation.s and characteristics of the Quebec Croup of Logan and Billings throughout the whole extent of the Provin-e ol (Quebec and contiguous districts, upon which to base the proofs for the validity and actual existence of such a group or series of terranes in diat portion of Xorth America. The eciuivalency of the term "Canadian iVriod,-- or " Canadian Epoch," as used by Prof James I). Dana and others, is also adduced as further evidence, corroborative of the magnihcent work performed by Sir William Logan in elucidating the complex structure of the Province of Quebec -which work with the exception of Sir William Dawson, in several papers and reports- found scarcely any ad\ocate, whilst its factors are based upon principles and data which are as durable as the rocks from which they proceed or with which they are re'ated. I ' < 1 1 r -• L wvcx u X X O ( 1. IlriisoN Rivi k S- 'I'UKNIOV, \. Hl.XtK RiVKR, Tetraiii'^. { l.nkkAlNi;.) I'kKN ION (iKOn- l,()WL'r I 5 ("IIAZV, I ('>. ("ai.cii i.Kors, I Ql-KIUC ("iRoll- I,L>, is. ISillcrv. The abow ta!)lc is ;^ivcn to iiiaicatc- the iclati .ns oi the various members of the Oalovician (Cambro-S.lurian) System in Canada showin- the positi:)n of the " Quebu- Tcna/ie " in the lower half of the system instead of bjing classed or groiii^ed alon^ with the Htidson River ( = Lorraine) terrane at the very top of the system as formerly. Th.j exac; relations, stratigraphical and palneontological, which exist b tween the QiiebeL", Levis and Sillery terranes have yet to bedefinetl. Their sequence aid order in the scale of tim- reipiire further investi- gations before this interesting fact can be ascertained on which Sir Wm. Logan md Mr. IMlings were still active .'Iv eng ged when called away.