328 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



ILLUSTRATIONS 



PLATES PAGE 



55. Fig. I. — Panoramic view from Shio Point, looking down Moose River 



Valley 334 



Fig. 2. — Panoramic view of Tah Peak, Mahto Mountain, and Calumet 



Creek 334 



56. Fig. I. — Looking south across Calumet Creek and Flats 336 



Fig. 2. — Looking southwest from south slope of Mahto Mountain.... 336 



57. Fig. I. — View from south slope of Mahto Mountain 338 



Fig. 2. — View from southwest slope of Titkana Peak 338 



58. Fig. I. — Panoramic view of the Robson massif 340 



Fig. 2. — Panoramic view of the Robson massif, with Hunga Glacier 



in foreground 340 



59. Figs. I and 2. — Panoramic view of Mural Glacier 342 



TEXT FIGURES 



II. — Near view of Tah Peak 330 



12. — Robson Peak from northwest slope of Mahto Mountain 331 



INTRODUCTION 



Robson, the most majestic known peak of the Canadian Rockies, 

 is situated six miles (9.6 km.) north in a direct line from the Fraser 

 River and the Mount Robson station on the Grand Trunk Pacific 

 Railway, and thirty-two miles (51.2 km.) west-northwest of Yellow- 

 head Pass on the Continental Divide. The Divide trends very 

 irregularly to the northwest and passes between Adolphus and Berg 

 Lakes three and one-half miles (5.6 km.) north-northeast of the 

 summit of Robson. At this point a part of the water derived from 

 the great Hunga Glacier (pi. 58, figs, i, 2) liows northeast into 

 the Smoky River drainage area of Alberta and thence through the 

 Peace and Slave Rivers to Great Slave Lake and north through the 

 Mackenzie River to the Arctic Ocean. The larger stream flows 

 southwest into Berg Lake and thence through the Grand Fork into 

 Fraser River and on to the Pacific. 



For my present purpose I have included in the Robson Peak Dis- 

 trict an area with a radius of about ten miles (16 km.) to the north- 

 east and south from the summit of Robson. I was prevented by bad 

 weather from visiting the region west of the Peak and across the 

 valley of the Grand Fork. As seen from above it appears to be 

 separated by a great fault line from the Robson massif. 



After a short reconnaissance. I decided to examine the geological 



