374 



FRANCIS PARKER SHEPARD 



the east side of the trench. The change in the character of the 

 beds containing the same faunal succession was the more notable 

 because the formations were dominantly calcareous. A few sample 

 sections (p. 373) will illustrate this point. 



The lithology of a section east of Harrogate (Fig. 4) would 

 indicate that there is an anticline or syncline forming the summit 

 of the Beaverfoot Range, because of the apparent repetition of 





je^ = Ordovician and Upper Cambrian 



|SdJ = Sir Donald quartzite (Lower Cambrian) 



[r] = Ross quartzite (Lower Cambrian and Beltian) 



[^ = Cougar quartzite (Beltian) 



Section along the main line of the Canadian Pacific Railway (after Daly) 



l€-ol = Ordovician and Upper Cambrian 

 i.B- I = Ross Quartzite (Upper Cambrian ?) 

 rcl = Cougar Quartzite (Cambrian ?) 



Same section revised 



Fig. 4 



the same formations in reverse order on the two sides. However, 

 fossils proved that this reversed succession was a mere coincidence, 

 and, as shown in the section, one side of the supposed anticline is 

 Devonian and the other Ordovician. An occurrence of something 

 of this sort in the Cranbrook area, or wherever else fossils were 

 lacking, could very easily introduce error into the classification. 



Metamorphic variations. — Metamorphic variations are espe- 

 cially important in the Purcell Range on the west side of the 

 trench. This is perhaps especially true in the Cranbrook area, 

 where there are more igneous intrusions than farther north, but 



