518 ALLEN DAVID HOLE 
Well-marked ridges or benches of glacial material corresponding 
in elevation to the upper parts of the drift accumulation near 
Keystone occur on the south side of the valley as follows: 
rt. Near Telluride, three-quarters of a mile west of Bear Creek. 
A small stream here enters the valley of the San Miguel from the 
south, and the moraine lies at an elevation of 9,750 feet across the 
mouth of the basin drained by this stream. The moraine is here a 
Fic. 4.—Recessional moraine (in center), in the valley of the San Miguel River 
about a half-mile east of the mouth of Remine Creek. Water in depression to left is 
held by adam. Elevation about 8,600 feet. ; 
well-marked ridge, and stands 30 to 4o feet higher than the surface 
of the basin just back of it. In composition the ridge is made up of 
a variety of rocks: San Juan, Telluride conglomerate, light- 
colored sandstone, and an occasional piece of Dolores sandstone. 
Striated bowlders were found at the point where the stream has cut 
through the moraine. The total length of the well-marked ridge is 
something less than 80 rods. An effort was made a few years ago 
