1 67 



7. Walcott, C. D. ...Smithsonian Misc. Coll., Vol. 53, 



1908. 



8. Penhallow, D. P.Geol. Surv. Can., Report on the 



Tertiary Plants of British Columbia, 

 1908. 



9. Shimer, H.W Geol. Surv. Can., Summary Report 



1 910, Lake Minnewanka section. 



10. Walcott, CD Smithsonian Misc. Coll.: Vol.57, 



Nos. 2, 3, 5, 6, 8; 1911-12. 



11. Daly, R. A Geology of the North American 



Cordillera at the Forty-ninth Par- 

 allel, Geol. Surv. Can., Memoir No. 

 38. 



ROCKY MOUNTAINS (Bankhead to Golden). 



BY 



John A. Allan. 

 STRATIGRAPHY. 



COLUMNAR SECTION. 



In the section across the Rocky mountains, between 

 the Cascade trough near Banff to Golden and the Columbia 

 valley, all the geological systems from the Pre-Cambrian 

 to the Cretaceous inclusive, except the Triassic, are repre- 

 sented. 



As shown in the tabulated section given below, the 

 stratified rocks aggregate more than 52,628 feet (16,040 m.) 

 in thickness. The thin-bedded strata, mostly shales, 

 make up 23,730 feet (7,235 m.) ; the limestones, 20,528 

 feet (6,255 m.) ; the quartzites and sandstones, 8,370 

 feet (2,550 m.). 



The relation between the Silurian and the Devonian 

 systems is not shown in this area, because the Cambrian, 

 Ordovician and Silurian formations are exposed mainly 

 on the western slope of the Rocky mountains, while the 

 remaining systems are exposed wholly on the eastern 

 side of the Continental watershed. 

 35069— 5A 



