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D This Ksm Is filnwd at th« r«duetion ratio etwdnd iMlow / Cft oocumftnt Mt nlfTw m tftux out roouctlon indl^iM cpoMSouSa lOx 14k 18x 22x MX 30x V 12x 16x 20x 24x 28x 32x The copy filmed h«r* has bean rapreducad thanks to iha ganarosity of: National Library of Canada L'axamplaira filmi fut raproduit grica i la S*n4rositi da: Bibliothaqua nationala du C a n a d a Tha imagas appaaring hara ara tha bast quality possibia eensidaring tha condition and lagibility of tha original copy and in kaaping with tha filming conuact spacifications. Las imagas suivantas ont At* raproduitas avac la plus grand soin. compta tanu da la condition at da la nanatO da l'axamplaira filmi. at an cenf ormitO avac las conditions du contrat da filmaga. Original copios in printod papar covara ara filmad baginning with tha front covor and anding on tha last paga with a printad or illustratad impraa- sion. or tha back covar whan appropriata. 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Thosa too larga to bo antiraly includad in ona axposura mrm filmad baginning in tha uppar laft hand cornar, laft to right and top to bonom, as many framas as raquirad. Tha following diagrams illustrata tha mathod: Un daa symbolos suivants spparaitra sur la darniira imaga da chaqua microficha. salon la eas: la symbols — » signifia "A SUIVRE". la symbolo ▼ signifia "FIN". Las cartas, planchas. tableaux, ate. pauvant otra filmte * daa uux da reduction diffOrants. Lorsqua la document est trop grand pour otre reproduit en un soul clichO. il est filmO A partir da Tangle supArieur gauche, de gauche A droite. et de haut mn bas. en prenant la nombre d'imegea nOcessaire. Las diagrammes suivants iUusuent la mOthode. 1 2 3 1 2 3 4 5 6 •WOOCOTY RBOWTION TKT CHART (ANSI ond ISO TEST CHART No. 2) ^ -APPLIED IIVVIGE I '653 East Main Str««t t "6; *a2- 0300 -Phone f"6) 2M-5fle9-FQ, / /. ^ ^)^- jBtpnvtmtnt of mines Hon. LOU... COUERKE, Minister; K. G. McCONNELL, Deputy Minister. . of Lake Timiskaming, the beds are nearly horizontal, xhe dolomite is light grey in colour, weathering buff, an I occurs in beds averaging about 1 foot in thickness. According to an analysis made by the Bureau of Mines' of Ontario, this dolomite contains 29-50 per nt lime and 21-59 per cent magnesia; and therefore, approaches a true dolomite in composition. 'Report of the Bureau of Mine*, Vi XIX, Pt. 11, p. 107, MUSEUM BULLETIN NO. 17. The following fossils were obtained from this quarry- undetermined ostracod. Slrophomena incurvala (Shephard)^ Pectorlhs sp., Madurea logani Salter, Cyrtocfras conslricto'. striatum Hall. At a small escarpment along the road between lots 8 and 9. Bucke township, just scnith of Dickson creek, dolomite similar to that of Farr's quarry furnished the following fossils- Re- ceptacHlUes occidentalis Salter. Zaphrentis small, crinoid columns and Madurea logani Salter. On the shore ,.f Lake Timiskaming just south of Moore creek, a:.d about 185 feet lower than the above occurrences, the following fossils were found: crinoid columns, Orthis sp Rhynchotrema inaquivalve (Castelnau), Murchisonia gracilis Of the above species Receptaculites occidentalis, Rhyncho- trema inaquivalve, Madurea logani, and Murchison:^ gracilis are common in the Black River limestones of Alumette island in the Ottawa river (above Ottawa), as learned by a comparison with material from that locality in the collections of the Geo- logical Survey. Dr. A. F. Foerste has also found Receptaculites occtdentalts jind Madurea logani in the Black River limestones of ClocJie island,' and an undetermined Madurea also occurs m the Black River rocks of Lake Nipis.ing.' Thus the Black Riv-er age of these beWs is well established and their correlation with beds farther south and southeast is clear. The 250-foot section on the east side of Dawson point where examined by the writer, is as follows: thiu-bedded bufT- cooured dolomites 20 feet above the normal level of the lake- talus slope of green shaly material mixed with dolomite up to 110 feet: thin-bedded dolomites about 115 feet thick containing near their base Pentamerus oblongus Sowerby. Camarotoechia ? neglecta HM? At yp. reticularis (Linnaeus); thick-bedded dolo- mites 25 feet tl.--' cntaining numerous x\iagara corals, some of which art: Favorites gothlandieus Lamark, Syringopora verti- ctllata Goldfuss, Halysites catenulatus Linnaeus, H. catenulatus var mtcropora Whitfield, Zaphrentis stokesi E. and H. Thick- ■Guide Book No. 5, I, -rnational Geoloqical Congrew, igi3 d M ■Barlow, A. E., Geol. Surv.. Can., Ann Rep., Vol. X, pp, 122 I. ' THit ORDOVICIAN ROCKS OF LAKE TiMrSKAMINC. bedded, huff to light grey dolomites, 10 to la feet thick, form the highest point on the hill. No fossils were found in these beds. The Pentamtrus oblortgus-Atrypa retu arts beds are prob- ably to l)e correlated with the Pentamerus beds 8 to 10 feet above the base of the Niagara (Lockport) dolomite of Maui- toulin island and the Bruce peninsula, and thus indicate the ap- proximate basi- of the Niagara. The same hori/on also occurs on Farr island about the mid- dle of a 12-foot section of tiiin-l)edded blue grey limestone where the following fossils were found: Favosites niagarensis Hill, Syringopora retiform:- '■ illings, Halysites catenulatus Linnaeus, Pentamerus oblongus Sowerby, Gypidula sp. and Rhynckotreta cuneata americana Hall ?. On the west side of Mann or Burnt island the following fossils were found, loose, on the shore: 9tromatoj)oroids,Zo/»/»re«/»j slokesi E.and H.. Favosites niagarensis Hall, Halysites catenulatus Linnaeus, Pentamerus oblongus Sower- by, Rhynchotnta cuneata americana Hall ?, Camarotoechia obtusiplicata (Hall) ?, Whitfieldella sp., Orthoceras sp. Near the northwestern extremity of the island the follow- ing section occurs: 8 feet above the lake (low water) about 3 feet of thin-bedded chocolate-brown dolomite protruding through the shingle of the beach ; beginning 16 feet a' "'e ' he lake, 10 feet of green even-bedded shale, mud-cracked ■ r the base; on top 6 feet or mor° of rather thin-1 edded c mites containing the following fossils: Streptelasma sp.. Strophonella sp., Orthis flabellites Foerste, Pentamerus o'jtjngus Sowerby, Atrypa reticularis (Linnaeus), Pleu-j'-maria sp. Chief island is a glaciated kn< '• ' ^ Huronian quartzite cut by diabase dykes. The irregularities Oi" its slopi.ig sides contain, at a few places (Plate I A), conglomerates composed of sub- angular Huronian pebbles enclosed in a limestone or dolomite matrix (Plate IB). On the south side of the island, a lenticular area of dolomite about 100 feet in diameter dips downward to the lake. It appears to have a maximum thickness of about 5 feet. From this point, Barlow obtained some lower Niagara fossils. The dolomite contains throughout small pebbles of Huronian rocks. MUSEUM BULLETIN NO. 17. On the east side of the island, fossils were obtained from a few square feet of dolomite, only a few inches in thickness. Here, both lower Niagara and lower Trenton species occur. The former include Penlamerus oblongus Sowerby, and Atrypa retic- ularis (Linnaeus) The Ordovician fossils are: Receptaculites oweni Hall ?, Strophomena trentonensis Winchell and Schuchert, Dalmanella testudinaria ( Dalman) , Rkynckotrema inaguivalve (Cas- telnau) ?. One other Silurian locality was noted. Just north of Hailey- bury wharf some thin limestones protruding through the beach gravel furnished Atrypa reticularis (Linnaeus) and Gypidula sp. This is f ither remarkable as at approximately the same elevation about one mile farther north, the Black River fossils occur, as already mentioned. Between the above localities two exposures about 20 feet apart and on the same north-south strike, have reversed dips, the one to the north dipping to the east at an angle of 19 degrees and the one to the south dipping to the west at an angle of 30 degrees. The strata are shattered and appear to have been disturbed by an east-west vertical fault. Thus fault- ing appears in this case to have been responsible for Ordovician and Silurian fossils appearing at the same level. We have next to consider: (1) whether the shales lying below the Pentamerus horizon are of Ordovician or of Silurian age ; (2) the general relations of the Ordovician and Silurian of the Lake Timiskaming region including any available evidences of faulting or other movements which may have affected the Palaeozoic strata. (") From the available field evidence bearing upon the age of the shales we can draw only a tentative conclusion. No unconformity was observed between the shales and the Niagara strata; and the general relations and characters suggest their correlation with the Cabot Head shales of Georgian bay, be- longing to the Cataract formation of upper Median age. How- ever, the Cabot Head shales of Manitoulin island which are the nearest outcrops to the Lake Timiskaming exposures are red in colour, and thus are quite different from the shales being con- sidered, which approach more closely in character the typical THE ORDOVICIAN ROCKS OF LAKE TIMIStCAMING. 7 shales at Cabot head. The alternative correlation apiwars to be that these shales are of Ordovician age perhaps belonging to the Cincinnatian group. (2) With the age of the shales in doubt, the data bearing upon the relations of the Silurian anrl Ordovician formations are rather meagre. We will first turn to Chief island. To explain the occurrence of both Niagara and Trenton fossils in the dolo- mites resting in the irregularities of the Huronian, only one hypothesis appears adcfiuate. That is, this resistant knob was washed by botIi Trenton and Niagaran seas, practically all of the Ordovician iloposits being eroded away before the Niagara deposits were laid down. The proximity of Niagara and Black River strata on the beach at Hailcybury admits of a different explanation as already stated. The Black River outcrops west of Haileybury are 185 or more feet (based on elevation of Hailcybury station) higher than the deposits near lake level, most of which are basal Nia- garan. At Dawson point the basal Niagaran beds are 110 feet above the lake. Thus in the case of strata that are gen- erally horizontal there is evidence of considerable differential movement including such faulting at least as is found near Haileybury. That a part of the difference of elevation may be due to irregularities in the floor upon which the sediments were deposited, is probable, but the conditions at Haileybury are certainly due, for the most part, to later movements. This conclusion is in accord with the statement by Dr. W. G. Miller ' — "Along the wagon road, in lots 5 and 6 in the 3rd concession of the township of Dymond, to the northwest of the town of New Liskeard, the limestone cliff presents a striking face, indicating faulting. The fault line is continuous with the western shore of Lake Timiskamiiig, and furnishes still further evidence confirmatory of the theory that the lake lies along a great northwest-southeast fault." It seems probable that Chief island and Dawson point are also separated by a fault. 'Re»«rt of the Burrau of Mines. Vol. XIX. Pt. II. p. 10». ■J J • museum bulletin no. 17. Other Northern Occurrences Related to the Black River-Trenton Formations of Lake Timiskaming. Receptaculites oweni Hall ? and Rhynchotrema inaquivalve (Castelnau) ? from the Trenton of Chief island assist us in cor- relating these beds with some other northern Ordovician occur- rences. Likewise Maclurea (Maclurina) manitobensis Whit- eaves, which appears to be closely related to Maclurea logani Salter, of the Lake Timiskaming occurrences, is found at several northern localities. Receptaculites oweni and Maclurea mani- tobensis are found in the Galena-Trenton formations in the Lake Winnipeg' region, and also at Silliman's Fossil Mount, Fro- bisher bay, Baffin island.* Maclurea, probably M. manitobensis, is reported' from one horizon of the Port Clarence limestone as found on the Don river of Alaska, and M. manitobensis is definitely reported from limestones of the Lower Ramparts* of the Porcupine river of Alaska, and again alonsj the 141st meri- dian between the Black and Porcupine riverh.^ Considering the small number of well established records of Black River and Trenton rocks in northern North America, each new discovery is of especial interest. The Lake Timis- kaming occurrence furnishes additional evidence of the once broad extent of these lower Ordovician strata, and indicates that their preservation has been due to protection from erosion, in this case at least, partly resulting from down-faulting. ■Whiteave*, J. F., Geological Survey of Canada, Palmzoic Fomils, Vol. Ill, Part III. •Schuchert, Cha«., Proc. U.S. National Museum, Vol. XXII, 1000, p. 149. 'Kindle E. M.. Am. Jour, of Science, Fourth Series, Vol. XXXII, 1911, p. 342 •Kindle, E. M., BuU. Geol. Soc. Am.. Vol. 19, 1908. p. 323. ■Caimes, D. D., Geol. Surv., Can., Samm. Kept., 1911, p. 28. Ml SKIM BlLl-ETlN No. 17 Plate 1. Surface of Huronian on Chief island, ii]mn which the I'ala-ozoic strata rest. Dawson point in distance. B. ^*K >^^i? Huronian rock-fragments incUided in basal Palieozoic dolomite. Chief isKind, Lake Tiniiskaming. N.L.C. - ■.N.C. iiiiiiliiit lilll 3 3286 08934703 9 llii- tir-^i mini iIhtoI til'' Miisiiini Uiilliiiii w.iMii litliil, ]'itl"ri,i Miiseiini h:il!(ii>i. Sum Tlu- liillo'viii;^ .iriii ,h,-r I. \v> 111" lllf < .fnliiui' ,il S.-iir- .il Mii-i'iiiii linllcliM^ li.ivf Ihtii i"iit Crnhiaiod Srrii> 1. rill 111 Mil 1 riniiiil, • Ml.iw.ii rii >. Niiic on MiTiHTiiui^ , W.ilrnll u», W. K. Hilling;-; liy lis I. 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