256 



W. D. WILCOX 



The two valleys to the east which are similar to the Lake 

 Louise Valley in size, direction and general features, have no 

 lakes similarly located, but there is a more or less pronounced 

 drift ridge on the upstream side of each. A swampy meadow 

 in each valley corresponds in position to Lake Louise, and these 

 meadows may represent filled-in lake basins. 



Of the very many lakes of the Lake Louise type to be found 

 in these mountains we shall only discuss one that was seen near 



Fig. 4. — Lake near Mt. Assiniboine showing the dam. 



the continental watershed in about latitude 51 ° N. at the base 

 of Mt. Assiniboine, a mountain about 12,000 feet in altitude. 

 The lake was small (Fig. 4), probably one third of a mile long, 

 and occupied the opening of a tributary valley to a stream of 

 moderate size. Owing to distance from the base of supplies in 

 this wild region, there was no time to make an examination of 

 the ridge damming this lake, but it was undoubtedly of drift 

 as was indicated by an abundant forest growth upon it. The 

 shape of this lake, the position of the outlet, and the course of 

 the stream deflected by the drift ridge, are clearly shown in the 

 photograph. This lake is typical of this mode of formation. 



