GLACIATION IN THE TELLURIDE QUADRANGLE 607 
it now has a diameter of nearly half a mile. Northeast of the lake 
the talus slopes come down to the water’s edge; on the southwest, 
steep, bare slopes of rock in place extend beneath the surface of the 
water. All along the trail leading into the basin, near the stream, 
roches moutonnées occur. The lake is reported to be 4oo feet deep 
300 yards from the lower margin; no means were at hand by which 
to verify or disprove the report. 
Mud Lake basin.—This basin is somewhat smaller than East 
basin. It contains a lake about one-fourth of a mile long and half 
as broad. An island in this lake, as well as the rock in place on the 
north side for about 75 feet above the water, shows the rounded 
outlines of roches moutonnées, but no distinct grooves or striae were 
observed above elevation 12,100 feet. At the head of the basin to 
the southeast are some rounded knobs of rock in place; but at 
intervals over the surface angular rock fragments up to 12 feet in 
diameter appear, partly buried in soil which in the summer is 
covered with low plants. Beyond this area are the bare talus 
slopes at the foot of the precipitous bounding walls. 
Gray’s basin.—Gray’s basin is still smaller than Mud Lake basin, 
and the elevation of its floor is also slightly less, being at 11,g00 
feet and over. Some rounded, projecting knobs of rock in place 
occur, but much of the bottom of the basin has enough soil to 
support a scanty growth of vegetation. In the southeast part of 
the basin a small rock stream lies at the foot of the talus slope. 
Jackass basin and Silver Lake basin.—These basins are char- 
acterized by the rounded forms of roches moutonnées, and talus 
slopes sufficiently weathered to support a low alpine flora. Silver 
Lake basin contains a small lake and has bounding walls less high 
than the other basins of the Bridal Veil system. 
The maximum thickness of ice in the main valley of Bridal Veil 
Creek was probably not less than 1,200 feet; in the tributary 
basins, from 200 to 400 feet. 
DEER TRAIL BASIN 
This basin is a small hanging valley lying more than 1,500 feet 
above the San Miguel River. Owing to its small size, and its 
elevation which is on an average perhaps 500 feet less than the 
