432 SWE PHN Re CAZES: 
The Tanana slope of the Alaska Range, between Mentasta 
Pass and Delta River Valley, is unsurveyed, and little is known of 
Fic. 7.—Gakona Glacier from below. The vegetation-covered terminal moraine indicates that the glacier is in a state 
Photograph by W. C. Mendenhall, 1902. 
of retreat. 
the glaciers there beyond 
the fact that as seen from 
Tanana River there ap- 
pears to be no great 
development of snow 
fields in these moun- 
tains, and it is likely 
that the ¢laiciers are 
smaller than on the 
south slope, as in other 
parts of the range. 
DELTA RIVER DRAINAGE 
Two large ice tongues 
push down toward Delta 
River from the east and 
furnish a _ considerable 
part of its waters. The 
uppermost of them, 
known as Canwell Gla- 
cier, heads opposite to 
Gulkana Glacier. Its 
upper basin is unsur- 
veyed. The terminus 
pushes down to within 
two miles of the Delta 
and is heavily moraine 
covered. A short dis- 
tance north of it an- 
other, Castner Glacier, 
terminates at the edge 
of the Delta Valley. Its 
front is somewhat ex- 
panded forming a bulb- 
