GLACIATION IN THE TELLURIDE QUADRANGLE 633 
than on the east, and is partially arranged in ridges approximately 
parallel to the stream’s course. 
The maximum thickness of ice in this valley was probably not 
more than 300 feet. 
VALLEY OF WILSON CREEK 
The glacier which occupied the valley of Wilson Creek was in 
the shape of a crescentic sheet concave toward San Bernardo 
Mountain. A short morainal ridge southeast of San Bernardo 
Mountain at 10,700 feet to 10,800 feet in elevation marks the lower 
limit of the ice to the east. Northward, down the valley of Wilson 
Creek, the ice extended to nearly 10,200 feet in elevation, crossing 
the stream at this point; above this point is a lacustrine flat which 
extends for nearly a mile along the stream. 
Above timber line to the west are the accumulations of talus 
and precipitous rock walls usually found in glacial cirques in this 
region. On the south the slope north of Black Face Mountain is 
mostly free from talus; some points are smoothed as if by the 
action of ice, but over most of the surface a thin covering of soil 
scarcely concealing the rock in place supports a growth of low plants. 
No precipitous wall is found on the south; the valley slope gradually 
flattens at the top to form the rounded crest of the ridge, which on 
its southern side is steep and furrowed with \-shaped gullies. 
Southeast of San Bernardo Mountain, above the short moraine 
already mentioned, the glacial deposits show an uneven surface at 
a few points, inclosing two or three ponds. On the west side of the 
valley north of east from Lizard Head, a morainic ridge at 10,800 
feet in elevation extends for a quarter of a mile in a north-south 
direction. Over most of the area, however, the surface is irregular. 
The lower slopes of the valley on both sides of the stream above 
the flat are heavily wooded at most points, obscuring to some extent 
both the topography and the composition of the surface deposits. 
At numerous points on the eastward-facing and northward-facing 
slopes, however, glacial drift is exposed, including bowlders in 
variety, some of which are well striated. In this respect these 
slopes are in sharp contrast to the southward-facing and westward- 
facing slopes of San Bernardo Mountain, where rock fragments are 
