15 



At Dunmore the route of Excursion C 2 leaves the main 

 line of the Canadian Pacific railway to follow the branch 

 line through the Crowsnest coal fields and the metal mining 

 districts of Southern British Columbia, joining the main 

 line again at Revelstoke, British Columbia. 



DUNMORE TO BURMIS. 



BY 

 D. B. DOWLING. 



INTRODUCTION. 



The country traversed by the Canadian Pacific railway 

 between Dunmore and Burmis is underlain by Cretaceous 

 and possibly Tertiary rocks (St. Mary River series). The 

 following are the geological formations in descending order : 

 St. Mary River series. 

 Pierre shales. 

 Belly River series. 



From Dunmore to a point a little east of Lethbridge 

 the country is underlain by the Belly River formation 

 arched in the form of a flat anticline, the centre of which 

 is probably near Bow island. The formation consists of 

 shales and sandstones of brackish water deposition referred 

 to Upper Cretaceous. 



Succeeding the Belly River are the marine Pierre shales, 

 the latest purely marine sediments of the plains. The 

 beds have a slight dip to the west, which increases south- 

 wards, and are faulted with small displacements showing 

 that the eftect of the Laramide revolution extended as far 

 east as Lethbridge. 



The St. Mary River sandstone marks the top of the Cre- 

 taceous and may possibly be Tertiary. The attitude is 

 that of a synclinal fold, the eastern limb being approximately 

 at the crossing of the railway over the Old Man river, 

 while the western limb lies between Pincher and Cowley at 

 the crossing of the south fork of the Old Man river. West- 

 wards from this point to Lundbreck successively lower 

 beds are crossed, and at Lundbreck the rocks, which are of 

 fresh and brackish water origin, are supposed to be the 



