NO. 15 



SMITHSONIAN EXPLORATIONS, I92I 



17 



The trail up the North Fork follows the bed of the river most of the 

 way to its head beneath Wilcox Pass. The same is true of the trail 

 up the west branch called Alexandra River, and its northwest exten- 

 sion named Castleguard River, by the Interprovincial survey of the 

 boundary between Alberta and British Columbia. Near the union of 

 Castleguard and Alexandra Rivers there is a fine view of the peaks 

 along the Continental Divide and Alexandra glacier. On one of the 



Fig. 19. — Mount Wilson and glacier from the southeast, with the eastern 

 section of the broad syncline, of which Mount Wilson is the western section, on 

 the right. 



Locality: View taken from south shore of Saskatchewan River about two 

 miles (3.2 km.) east of Mistaya Creek and 47 miles (75.2 km,.) northwest from 

 Lake Louise Station on the Canadian Pacific Railway, Alberta, Canada. (Mrs. 

 Mary V. Walcott. 1921.) 



misting days of early September a photograph of Alexandra glacier. 

 Queens Peak, and jNIount Alexandra was taken from the river bed 

 and is reproduced as figure 20. 



Castleguard River heads in a deep, rather broad canyon at the foot 

 of the Castleguard glacier. Thompson Pass is on the southwest and 

 high barrier ridges on the northeast. On the summit of the latter 

 great terraced buttes occur with narrow side facing the line of drainage 

 (fig. 21). These outlying buttes are formed of the alternating hard 



