GLACIATION IN THE TELLURIDE QUADRANGLE 621 
on the east side for about a mile and a half; in places the deposit 
consists of irregular hillocks; in places it becomes a distinct ridge 
near the stream. On the west side of the stream the moraine is not 
so well marked; in general, however, a somewhat flattened belt on 
the western slope corresponds in height to the top of the moraine 
on the eastern side. At 9,200 feet in elevation the steep slopes of 
the moraine lie on both sides of the stream. The well-marked 
morainal deposits do not extend above the alluvial flat lying 
between 9,200 and 9,300 feet. 
The higher glacial deposits on the mesa east of Bilk Creek have 
already been described. On the edge of the mesa to the west, a 
forest growth obscures the deposit for much of the first two miles 
south of the San Miguel River; yet within this area at numerous 
points exposures of characteristic glacial deposits occur, including 
bowlders in variety. Farther south and continuing as far as the 
alluvial flat lying between 9,200 and 9,300 feet in elevation, the sur- 
face is covered with drift arranged sometimes as ridges, sometimes 
as irregular hillocks 50 to 75 feet high, inclosing numerous kettles. 
On the east side opposite the alluvial flat and for two miles down- 
stream, the slope is shorter and steeper, and the topography is less 
irregular. One distinct ridge occurs, however, extending from 
about 9,400 to 9,800 feet in elevation, approximately parallel to the 
medial moraine already described, and lying about a quarter of a 
mile farther to the southwest. No distinct lateral moraine is found 
on the east side except for a short distance opposite Magpie Gulch 
at 9,900 to 10,000 feet elevation. 
The maximum thickness of ice in the valley of Bilk Creek was 
probably about 1,000 feet. 
VALLEY OF CANYON CREEK 
That part of the valley of Canyon Creek included in the 
Telluride quadrangle is almost wholly free from glacial débris. 
Roches moutonnées abound, with striae in places. On the west side 
of the tributary heading west of Stony Mountain, at 12,000 feet in 
elevation, striae on bed rock bear N. 43° E. Cross has recorded 
striae near the Trust Ruby Mill along the north branch of Canyon 
Creek.1 The topography of the valley as a whole is extremely 
Telluride Folio, p. 15. 
