GLACIATION IN THE TELLURIDE QUADRANGLE 635 
its lower part, with morainal deposits below about 10,500 feet in 
elevation. On the east side of the valley a distinct lateral moraine 
extends from about 10,400 to 9,800 feet elevation, the upper end 
being farther from the stream than the lower. On the west side a 
morainic ridge extends from about 10,000 feet in elevation down 
into the valley of the Dolores River. The glacier on Flat Top 
Mountain probably did not exceed 200 feet in thickness at the 
maximum. Its action was not vigorous, and probably only a small 
portion of the whole mass of ice reached the valley of the Dolores 
River. 
The source of the largest amount of ice entering the valley of 
the East Dolores River was in the cirques south of Sheep Mountain. 
Above 12,000 feet in elevation the cirques show the usual variations 
in gradient, some cliffs from 60° in slope to perpendicular, some 
slopes more gentle, 10° to 20° with irregular topography due in part 
to weathered heaps of talus, in part to irregularities of the rock 
floor. Back of the last more level portion are the slopes of bare 
talus and the precipitous bounding walls. Below 12,000 feet in 
elevation the rock in place is largely obscured by weathered rock 
waste and glacial drift which in places supports a considerable 
forest growth. 
At the point where the stream draining the two cirques enters 
the East Dolores River, drift hills are abundant on the east side of 
the river. The edge of the ice here pushed up the valley of the 
East Dolores to the south for a half a mile, leaving a moraine at 
10,250 feet in elevation with its top 30 to 4o feet above the stream. 
For nearly a mile and a half on the north side of the stream draining 
the two cirques drift hills cover the slope up to about 500 feet above 
the stream. In some places the topography is irregular, but more 
often there are more or less distinct ridges, either approximately 
parallel to the course of the stream, or tending to become oblique 
by an approach of the ridge to the stream in the downstream 
direction. South of the stream the drift hills continue up to about 
10,600 feet in elevation. In the drift on both sides bowlders occur 
in variety, many of them striated. Above the well-marked drift 
hills, frequent accumulations of glacial débris, in some cases inclosing 
undrained depressions, continue for a half a mile or more. 
