GLACIATION IN THE TELLURIDE QUADRANGLE 639 
4. East side of pass along the trail leading from the Trout Lake 
branch of Lake Fork to the South Fork of Mineral Creek, at 
elevation 12,000 feet, bearing S. about 75° E. 
5. In the upper part of the valley of Mill Creek, at 12,500 feet 
elevation, three-fourths of a mile from the eastern boundary of the 
quadrangle, bearing nearly due east. 
Lakes and ponds in rock basins, most of which are of sufficient 
size to be mapped, occur in the following valleys: 
1. Valley of Lime Creek southwest of Twin Sisters Mountain, 
at an elevation of from 12,000 to 12,500 feet. 
2. South Fork of Mineral Creek south of Beattie Peak, at 
11,500 to 12,000 feet elevation. 
3. Ice Lake basin, at 11,500 to 12,800 feet elevation. 
4. Clear Lake, one mile east of U.S. Grant Peak, at 12,000 
feet elevation. 
5. East of Ophir Pass, at 12,000 feet elevation. 
6. Mill Creek basin and cirque next south, at 12,000 to 12,500 
feet elevation. 
Rock streams are found in the south part of Paradise basin, and 
to the north and west of Twin Sisters Mountain. In the valley of 
Cascade Creek at 11,200 feet elevation a small alluvial flat occurs 
such as is due to the silting-up of a pond or lake. 
The maximum thickness of ice in these valleys was in the South 
Fork of Mineral Creek where it must have reached more than 
‘ 1,500 feet; the maximum in the valley of Cascade Creek was 
probably not much less. 
