C URRENT PRE- CA MBRIA N LITER A TURE 4 2 1 



the more or less highly altered and often schistose diabases and gab- 

 bros. The largest area of Huronian is found along the coast of Hudson 

 Bay from Baker's Foreland south to a point forty-five miles north 

 of Cape Esquimaux, and inland for seventy miles up the Ferguson 

 River. Other areas are found between Schultz and Baker lakes, near 

 Lake Angikuni, near Kasba and Ennaidai lakes, the north shore of 

 Doobaunt Lake, and the east shore of Wharton Lake. 



The Huronian rocks are overlain unconformably by the Athabasca 

 sandstone. As this sandstone is older than the flat-lying Cambro- 

 Silurian limestone, and unconformably above the Huronian, it is 

 assigned to the Cambrian, although no fossils were found in the for- 

 mation. Lithologically the whole terrane presents a remarkable 

 resemblance to the red sandstones and Cambrian quartz porphyries of 

 the Keweenawan rocks of Lake Superior, and the two terranes'are 

 regarded as holding essentially similar positions in the geological time 

 scale. 



Low 1 reports on his explorations of the Labrador Peninsula, along 

 the East Main, Koksoak, Hamilton, Manicuagan, and portions of 

 other rivers. Laurentian rocks occupy nine tenths of the area of the 

 Peninsula. They include gneisses and schists, some of clastic origin, 

 some of eruptive origin. The clastic portion is in nearly all cases the 4 

 oldest. 



The Huronian rocks comprise beds of arkose, conglomerate, lime- 

 stone, shale, slate, sandstone, chert, quartzite, mica-schist, and erup- 

 tives, in part at least contemporaneous with, and at present represented 

 by, schists characterized by chlorite, epidote, altered hornblende, 

 hornblende, sericite, and hydromica ; also diabases, diorites, and various 

 granites. They occur in two large areas and several small ones. The 

 large areas are along the East Main River from near the mouth inland 

 for 1 60 miles, and the area of the large lakes southwest of Lake Mis- 

 tassini. 



The Laurentian and Huronian rocks are overlain with strong uncon- 

 formity by a series of rocks classified as Cambrian, comprising arkose, 

 sandstone, limestone, dolomite, felsitic shale, argillite, and argillaceous 

 shale, together with gabbro, diabase, fine grained, decomposed traps, 



1 Report on explorations in the Labrador Peninsula, along the East Main, Kok- 

 soak, Hamilton, Manicuagan, and portions of other rivers, in 1892, 1893, 1S94, and 

 i8;S. by A. P. Low: Ann. Rep. Geol. Surv. of Canada, Vol. VIII, 1897, Part L, 

 pp. 387. With geol. maps. 



