209 



Kilometres ^ s ^ e train emerges from the last snow-shed, 



the western limb of the sharp anticline, shown 

 in the general structure section, may be seen 

 on the left. 



84-1 m. Rogers Pass — Alt. 4,302 ft (1,311 m.). 

 135-4 km. This station is situated on the axis of the main 

 Selkirk syncline. The fold is here broken and 

 faulted but the flat-lying beds of the axis can 

 be seen, in clear weather, on the slopes to the 

 north-northwest. The eastern limb is clearly 

 apparent but the western limb is best exposed 

 in the upper canyon of Bear creek. An oblique 

 view of the subsidiary folds already passed 

 over may be had toward the northeast, in 

 the crags of Mt. Tupper. 



The railway follows the axis of the main 

 87-3 m. syncline to Glacier — Alt. 4,086 ft. (1,245 m.). 

 140-5 km. Here the Illecillewaet and Asulkan glaciers are 

 reached by good trails. The former drains the 

 Illecillewaet snowfield (25 square km. in area) 

 at its northern end, while the Geikie glacier 

 drains it at the south. The Asulkan glacier 

 is one of the several sheets heading on the 

 rugged ridge culminating in Mt. Bonney. All 

 of the glaciers are rapidly retreating, as 

 illustrated in the accompanying figures. 



The special map and section of this region, 

 makes a detailed description of the local geology 

 superfluous, but some remarks may be helpful. 



The noble peak of Mount Sir Donald (10,808 

 ft.; 3,292 m.) to the southeast is composed of 

 the Sir Donald quartzite, well jointed in sheets 

 which from a distance deceptively resemble 

 individual strata. The true dip of the quart- 

 zitic sandstone is to the E.N.E., at angles 

 varying from 6o° on the western slope to 15 

 or less at the eastern foot of the horn. Mount 

 Sir Donald is, in fact, a remnant of a long, 



