211 



narrow, synclinal wrinkle adjoining the great 

 Beaver River (Purcell trench) anticline. A 

 subsidiary anticlinal axis, paralleling this syn- 

 cline on the southwest, runs nearly through 

 the crest of Eagle and Avalanche mountains 

 and is probably coincident with the one just 



Mt. Sir Donald from Eagle mountain; Mt. Uto in foreground. Photograph by Howard 



Palmer. 



west of Mt. Macdonald summit. The western 

 limb of this fold is also the western limb of 

 the syncline followed by the railway from 

 Rogers Pass to Glacier. 



Another local anticline in the quartzite is 

 well exposed near tree-line on Mt. Cheops 

 and is continued across the Illecillewaet into 

 Mt. Abbot. Some faults and numerous small 

 slips, parallel to the general strike, have com- 

 plicated the structure between Mt. Sir Donald 

 and Cougar creek. On this account, and 

 because of the close similarity of the Sir Donald 



