20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 
remarkable features of Robson Peak on the north is Blue Glacier. 
It is two miles in horizontal distance, and 7,000 feet in vertical fall 
between the snow cornices of Robson Peak and the foot of the 
glacier where the ice breaks off to float away as small bergs. Blue 
Glacier is a wonderful stream of falling, shearing, blue, green, and 
white ice. As seen in figure 24 the details of its marvelous descent 
are finely shown. 
Iyatunga Mountain and Titkana Peak form the gateway to the 
great Hunga Glacier which is literally a river of ice. In figure 
Fic. 24—Kodak view of Blue Glacier, with Robson Peak concealed by mist. 
Photograph by Walcott, 1912. 
27 three miles of its lower length is shown; the upper part is exhib- 
ited by figure 28, where the gathering fields of snow are seen on the 
slopes of Robson Peak and Mount Resplendent, and below the flow of 
the glacier over the cliffs where it merges into the broad river-like 
extension below. 
The geological section was measured from Moose Pass (figure 30) 
southwestward over Tah Peak, Mount Mahto, Titkana Peak, and 
across by Phillips Mountain and the ridges of Lynx Mountain to 
Robson Peak. 
