622 ALLEN DAVID HOLE 
rough and uneven in spite of the general absence of angular points 
and sharp lines which is due to the smoothing action of the ice. 
This impression is heightened by the sharp, rugged lines of the 
precipitous bounding walls. The summit of Stony Mountain is also 
very rough; it is, therefore, believed to have stood as a nunatak 
when the ice was at its maximum. Near the western side of the 
valley, two rock streams occur, one of which is shown in Fig. 8, and 
a little lower down, at 12,200 feet in elevation, a small lake in a 
rock basin. 
The maximum thickness of ice in that part of the valley of 
Canyon Creek included in the Telluride quadrangle was probably 
not less than 1,500 feet. 
CIRQUES NORTH OF DALLAS PEAK 
The cirques lying northeast, north, and northwest of Dallas 
Peak were occupied by glaciers which extended northward to an 
undetermined distance. Roches moutonnées, lakes in rock basins, 
rock streams, talus slopes, and precipitous bounding walls are 
present here as in the other cirques of the region. 
VALLEY OF DEEP CREEK—EAST FORK 
In the cirques tributary to the East Fork, lying north of Iron 
Mountain and Campbell Peak, talus slopes and rock streams are 
the chief features. The opposite side of the valley has precipitous 
rock walls in places at the top, with talus slopes below, extending 
sometimes 1,000 feet down to the stream. Along the main stream, 
roches moutonnées occur at 10,400 feet in elevation on the south side 
of the stream, and at 11,000 feet elevation between the two cirques 
lying north of Iron Mountain. 
At elevation about 9,700 feet on the west side of the stream, a 
small accumulation of glacial débris is found. It extends from the 
stream to the west talus slope, with its surface about roo feet above 
the bottom of the valley. It consists of fragmental and rounded 
bowlders in variety up to 4 feet in diameter. Small depressions 
exist between this deposit and the talus to the west. No sign of a 
similar deposit is seen east of the stream at this point; but there is 
little opportunity for the lodgment of débris on the east side, as the 
