133 



Columnar Section of the Beltian System in the Selkirk 

 Mountains. 







Approximate 





Thickness. 





Feet. 



Metres. 



Top, erosion surface. 







{ Ross quartzite (in part) .... 



2,500 



762 



Glacier Division 1 Nakimu limestone 



35o 



107 



(Selkirk series of) Cougar formation (quart - 







Dawson). [zite with metargillitic beds) 



10,800 



3.292 





Laurie formation (metar- 









gillite, often calcareous; 







Albert Canyon 



with subordinate inter- 







Division 



beds of limestone and 







(Nisconlith series 



quartzite; basal bed, gray 







of Dawson) . 



limestone 15 m. thick). . 



15,000 



4.572 





Illecillewaet quartzite 



1,500 



457 





Moose metargillite 



2,150 



655 







170 



52 





Basal quartzite 



280 



85 



Base, unconformity with Shuswap terrane. 











32,750 



9,982 



In the railway section the basal quartzite is a greenish- 

 gray, fine-grained metarkose, a massive to well-bedded, 

 feldspathic rock of quartzitic habit, though strongly 

 charged with films of sericitic mica. The original material 

 was the somewhat washed sand due to the secular decompo- 

 sition of the underlying Shuswap orthognesis. It will be 

 described in greater detail in a following account of the 

 geology about Albert Canyon station. 



At its top the quartzite is interleaved with the lowest 

 layers of the overlying limestone. This is a thin-bedded 

 to thick-bedded, white to bluish marble, generally weather- 

 ing to a pale buff colour. It is magnesian throughout, 

 though some beds are more purely calcitic than others. 



The Moose metargillite has been so designated from an 

 older name of Albert creek, which enters the Illecillewaet 

 river at Albert Canyon station. The middle part of this 

 formation has not yet been found in satisfactory exposure 



