SUMMARIES OF PRE-CAMBRIAN LITERATURE OF 



NORTH AMERICA FOR 1909, 1910, 191 1, AND 



PART OF 191 2 



EDWARD STEIDTMANN 



University of Wisconsin 



V. QUEBEC 



Barlow^ states that the Chibougaman region of Quebec is 

 underlaid by Keewatin, Lauren tian, and Huronian formations, and 

 a gabbro anorthosite. 



Barlow^ states that the Chibougaman region, lying between 

 latitudes 49° 30' and 50° 11' 06" north and longitude 70° 03' 40" 

 to 74° 35' 50", about 300 miles north of Montreal, has the follow- 

 ing pre-Cambrian succession region, beginning with the oldest: 

 (i) Keewatin, serpentine and pyroxenite; deformed quartz por- 

 phyry and porphyrites, basalts, diabases and gabbros; (2) anortho- 

 site intrusive into Keewatin; (3) Laurentian granites, granite and 

 diorite gneiss intrusive into (i) and (2); (4) unconformity; (5) 

 Lower Huronian — slates, sandstones, arkose and conglomerate. 



Bancroft^ classifies the pre-Cambrian rocks of the Harricanaw 

 and Nottaway rivers of northwestern Quebec as Keewatin meta- 

 morphosed extrusive and intrusive basic and acid igneous rocks 

 with bands of highly altered sedimentary rocks; Laurentian 

 granites and granite gneisses intrusive into the Keewatin; Lower 

 Huronian ( ?) conglomerates, graywacke, slate, and arkose, injected 

 by granite ; post-Middle Huronian (Keweenawan ?) dikes of quartz 

 and olivine diabase. 



'"Geology of the Chibougaman Region, Quebec," Canada Geol. Soc. Am. Bull., 

 XXII, No. 4 (191 1), 738 pp. 



^ "Geology and Mineral Resources of the Chibougaman Region," Report by the 

 Chibougaman Mining Concession, Province of Quebec, Canada, 1911, 215 pp., 68 pis., 

 19 figs., 2 maps. 



3 J. A. Bancroft, "Geology and Natural Resources of the Basins of Harricanaw 

 and Nottaway Rivers, Northwestern Quebec," Province of Quebec, 1912, 16 pp., 

 I map. 



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