30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



all sides the limestone is the surface rock and the superjacent 

 beds have been removed by erosion so as to form deep canyons. 

 The west face of the mountain shows the Beltian beneath, with 

 Lower Cambrian Mt. Whyte formation resting on it. The section 

 was hurriedly examined with the following result. 



CAMBRIAN 



Elko Limestone: ^"t Meters 



I. Thick-bedded, hard, gray magnesian limestone in ledges 



and broken down cliffs. (Estimate) 1,800 548.6 



Concealed by debris ; 500 1524 



The debris may cover the shales and limestones of the 

 Middle Cambrian, Burton formation. 



lower cambrian 



Mt. W'hyte ? Formation : 



I. Silicious and arenaceous shales with some calcareous layers 



in the upper part 400 121.9 



Fauna. 



Micrometra (P.) labradorica Billings 

 Kutorgina cingulata Billings 

 Nisusia festinata (Billings) 

 Wanneria sp. 



OlencUus cf. argcnta Walcott 

 Olenellus cf. frcmonti Walcott 

 Olenellus ? sp. 



Corynexochus Heldensis Walcott 

 Prof. Schofield found in addition to the above Stenothcca 

 rugosa Hall and an Agraulos-Mke cranidium of a small 

 trilobite. 

 Sandstone with many small white quartz pebbles. (Esti- 

 mate) 125 38.1 



Disconformity. 



BELTIAN 



Reddish brown argillites, hard sandstones, and fine con- 

 glomerate. Estimate 1,000 + 304.8 



The above section is introduced here as it is the nearest to the Beaverfoot- 

 Brisco-Stanford Range in which undoubted Cambrian occurs. Prof. S. J. 

 Schofield discovered Lower Cambrian fossils at the north end of Grainger 

 ]\Iountain and sent them to me for examination and published a list of the 

 genera and species in 1922^ with my comments on the fauna as follows: 



The various species mentioned above are characteristic of the Lower Cam- 

 brian Mount Whyte formation of the section at McArthur Pass and 3 miles 

 east of Field, B. C. There is nothing to suggest a Middle Cambrian fauna 



^ Geol. Surv. Canada, Geol. Series No. 42, Bull. No. 35, 1922, p. 14. 



