624 ALLEN DAVID HOLE 
the steep slopes of the ridge west of the stream. Striae on rock in 
place occur at 9,300 feet elevation on the east side of the stream, 
with a direction approximately parallel to the valley’s course. 
The maximum thickness of ice in this valley was probably about 
500 feet. 
VALLEY OF DEEP CREEK—WEST FORK 
The cirques which supplied the ice for the glacier in the West 
Fork of Deep Creek lie wholly to the north of the Telluride quad- 
rangle. The glacial deposits in this valley are not in general 
well marked topographically. Glacial débris, including striated 
bowlders, occurs in abundance on the west side of the stream at an 
elevation of from 9,300 to 9,500 feet, and for nearly a mile farther 
down bowlders in variety appear occasionally at the surface. On 
the east side of the stream a deposit of glacial drift is found, begin- 
ning as a shelf at 9,600 feet, changing to the south into a ridge with 
a slight depression to the east, and extending to an elevation of 
9,250 feet. This ridge contains bowlders in variety up to 6 feet in 
diameter. The lowest point at which drift occurs on the east side 
of the stream is at an elevation of about 9,000 feet, where it is found 
at distances ranging up to 60 or 70 feet above the bottom of the 
valley. In general, the western boundary of the glaciated area is 
not well marked, as the distinction along the lower part between the 
glaciated area near the stream and the landslide area to the west 
and southwest, east of Hawn Mountain, is not clear. 
VALLEY OF PROSPECT CREEK 
A small glacier of not more than 200 or 300 feet in maximum 
thickness occupied the upper portion of the valley of Prospect 
Creek. In the upper part of the valley rounded, projecting points 
of rock in place occur, and the appearance at the head of the basin 
is the same as in the other cirque-valleys of the region; that is, 
precipitous cliffs in a broad arc at the head with talus slopes below. 
The valley is broad and flat bottomed in cross-section, though 
having a steep longitudinal profile. In the upper part some ponds 
occur, together with several small, level, marshy areas, which are 
evidently the sites of former basins, now silted up. 
In the half-mile just above the 10,500-foot line the surface on 
both sides of the stream is thickly strewn with large angular or 
