614 ALLEN DAVID HOLE 
UPPER VALLEY OF LAKE FORK 
The upper valley of Lake Fork drains a valley proportionately 
much broader than the other glaciated valleys of the region. Asa 
consequence of its greater width, the action of the ice was less 
vigorous, and much glacial débris remains. At its maximum a 
glacier as much as 1,000 feet in thickness moved northward from 
this valley to join that coming from Howard Fork, as shown by 
ia 
Fic. 5.—Point below small lake at 11,600 to 11,700 feet, four miles’southeast of 
Trout Lake. Glacial ice passed over this point. 
glacial striae on rock in place on the east side at 10,000 feet elevation 
near the Terrible Mine, glacial débris on the same slope 100 to 
200 feet higher, and similar deposits on the west side where the edge 
of the ice crowded up on the north side of the valley of Wilson 
Creek, at an elevation of 9,800 to 9,900 feet. 
That part of the main valley lying above 10,000 feet in elevation 
is for the most part well cleaned out. Near the main stream, 
however, considerable soil has accumulated and supports a forest 
