SMITHSONIAN MISCELLANEOUS COLLECTIONS- 



VOL. 75 



jQAiy eiqti/n/oj 



account of the stratigraphy and 

 structure of the Lower Paleozoic 

 formations in and adjoining the 

 " Rocky Mountain Trench." 



The stratigraphic section of 

 Al'.an, south of the Kicking Horse 

 Canyon on the line of the Canadian 

 Pacific Railway, crossed the Beaver- 

 foot Range a few miles south of 

 Golden, where he found Ordovi- 

 cian and Silurian ^ formations near 

 the summit of the range overlook- 

 ing the " Rocky Mountain Trench." 

 The Silurian was identified by con- 

 tained corals, and the Ordovician 

 by the Glenogle graptolites. A dia- 

 grammatic section by Allan shows 

 the complicated structure of the 

 northern portion of the Beaverfoot 

 Range. It is reproduced in outline 

 in figure i. 



Schofield working to the south 

 found Lower and Middle Cambrian 

 and Devonian in the Elko district, 

 and on the* eastern side of the 

 Trench at Canal Flats supposed 

 Middle and Tapper Cambrian over- 

 lain by Devonian.^ 



Shepard in connection with his 

 study of the " Rocky Mountain 

 Trench " examined several sections 

 of the Beaverfoot-Brisco-Stanford 

 Range on the western side and 

 eastern wall of the Trench, and sum- 

 marized his observations on the 

 stratigraphic series as follows : 



' Loc. cit., p. 60 of Memoir ; also Geol. 

 Surv. Canada, 1913, Geol. Excursions 

 Int. Geol. Congress, C. i. Guide Book 

 No. 8, pt. II. Colored structural section 

 in pocket. 



' Trans. Roy. Soc. Canada, 3d Ser., 

 Vol. 14, Sec. IV, 1920, p. 76; also Geol. 

 Surv. Canada, Geol. Ser. No. 42, Bull. 35, 

 1922, p. 15. 



