GLACIATION IN THE TELLURIDE QUADRANGLE 637 
the cirques lying south of Sheep Mountain. The slopes on the 
south side of the stream, however, and the ridge bounding the valley 
on the south are distinctly different. These slopes are covered 
with bare talus and show an uneven, hilly topography due to the 
weathering of numerous irregularly disposed bosses of outcropping 
rock. The rock in place is completely mantled with angular frag- 
ments, and on the west and northwest sides of Grizzly Peak the 
long, steep talus slopes extend practically to the summit of the 
mountain, giving to this part of the cirque an appearance which 
contrasts sharply with the usual precipitous walls which bound 
most of the other cirques. 
Glacial ice of the more recent epoch extended down to about 
10,700 feet in elevation. At this point the glacial deposits are best 
preserved on the north side of the stream, where drift hills 150 feet 
high show a slope of about 30° both to westward and to southward. 
For about half a mile eastward on the upper part of the slope on the 
north side of the stream, drift occurs containing bowlders up to 
8 feet in diameter, some of which show striations. Drift with 
striated bowlders also occurs on the south side of the stream, but a 
small tributary not shown on the topographic sheet either has pre- 
vented the deposition of as large an amount, or has carried away 
much of what was deposited. The lower part of the glaciated area, 
up to about 11,500 feet in elevation, is mostly forest-covered. The 
topography is irregular, with some undrained depressions. 
- The maximum thickness of ice in this valley was probably about 
300 feet. 
CIRQUE-VALLEYS TRIBUTARY TO THE ANIMAS RIVER 
All the cirques and valleys lying in San Juan County in ine 
southeast part of the Telluride quadrangle are drained by tributaries 
of the Animas River. With the exception of deposits on the north 
side of the stream eastward from Ophir Pass and in the lower part 
of the valley next south, where drift hills with striated bowlders 
occur up to 4oo feet above the stream, these valleys and cirques 
are all practically free from glacial débris (Fig. 14). In general, 
abundant talus covers the slopes at the base of steep cliffs, while 
on the more level portions more or less well-developed roches 
moutonnées are found. In many places the rock in place weathers 
