136 



account of the general uniformity of composition and habit, 

 no satisfactory subdivision of the formation is yet feasible; 

 because of their limited exposure in the railway zone, the 

 quartzitic beds cannot be used for subdivision. 



The Albert Canyon division of the Selkirk series is 

 thus chiefly of metargillitic composition. The overlying 

 Glacier division, more especially as it crops out on the wes- 

 tern slope of the Selkirk range, is dominantly quartzitic. 



Its most heterogeneous member is the Cougar formation, 

 named from Cougar mountain, in which it is exposed on a 

 great scale. In the monocline between Caribou creek and 

 the Caves of Cheops (Nakimu), the formation shows the 

 following general succession. 



Columnar Section of the Cougar Formation. 



Conformable base of the Nakimu limestone. 



Gray, thin-bedded to thick-bedded quartzite, 

 weathering rusty; with thin interbeds of 

 phyllite and white quartzite; a few seamlets 

 of crystalline limestone in the uppermost 

 quartzite 



Conspicuous band of white, homogeneous, 

 massive quartzite 



Massive, light gray quartzite, interrupted by 

 many bands of gray, quartzitic grit and 

 coarse sandstone and by beds of dark gray, 

 silicious metargillite; about 1,000 feet 

 (305 m.) from the top, a thick band of 

 massive white quartzite 



Quartzitic and phyllitic, gray sandstone and 

 fine conglomerate with metargillite. Near 

 the middle of this zone, angular fragments 

 of altered basaltic rock (bombs?) enclosed in 

 an argillaceous (?)base were found 



Altered basaltic lava 



Thick-platy to flaggy, sometimes phyllitic, gray 

 quartzite 



Conformable top of Laurie formation. 



3.292 



