GLACIATION OF THE ALASKA RANGE 427 
Tokichitna Glacier, the principal source of Tokichitna River, 
joins the east-west valley of that stream from the north, 33 miles 
below the end of Little Tokichitna Glacier. It is one of the four 
largest glaciers of the range, and the borders of the lower 20 miles 
of the main lobe have been mapped. For this distance theice stream 
averages nearly 2 miles in width, with a maximum width of over 24 
miles. The upper unexplored portion lies among the high, rugged 
peaks of the range, and probably heads on the slopes of Mounts 
McKinley and Hunter. The total length must be nearly 30 miles. 
Fic. 4.—The moraine-covered lower portion of Little Tokichitna Glacier, r911 
The lower end is moraine covered for several miles above the 
terminus, but above the first bend white ice appears. A heavy 
growth of spruce timber, close to the front edge of the glacier, 
‘shows that the ice edge is now as far advanced as it has been for a 
long time, and probably indicates a state of equilibrium between 
supply and wasting. 
Near the mouth of Tokichitna River a third, very large glacier 
pushes out from the mountains from the northwest and spreads 
out into a bulb-shaped piedmont lobe over 4 miles wide. It is 
known as either Mud or Ruth’ Glacier, the former being the name 
most generally used by the miners of the district, and said to have 
tF, A. Cook, To the Top of the Continent. Doubleday, Page & Co., 1908, p. go. 
