GLAGIAE STUDIES IN GREENLAND. . 571 
cation. The one predominates in the white ice and the other 
in the discolored. The first consists of an alternation of 
layers of porous, opaque, white ice with layers of compact, 
transparent, blue ice. The blue layers are thin, while the 
Fic. 36.—Nearer view of the middle of the front wall of the Bryant glacier, show- 
ing details of stratification and the trench cut in the face of the glacier and of the talus 
slope by a small stream descending from the surface of the glacier. 
white layers are relatively thick. This form of stratification 
extends into the discolored portion, but the distinctive stratifica- 
tion of this portion consists of the introduction of layers of rock 
débris between sheets of ice. In general this débris was found 
