GLACIATION IN THE TELLURIDE QUADRANGLE Lea 
bottom of the pre-glacial channel of the San Miguel River exposed in 
the process of hydraulic mining below Keystone as referred to above. 
In addition to the drift near Keystone, deposits distinctly 
morainal in character occur at two other points in the bottom of the 
valley. One of these points is between one-fourth and one-half a 
mile eastward from the mouth of Remine Creek; the other, just 
east of Eder Creek. Both of these accumulations are to be regarded 
as small recessional moraines. ‘The westernmost one consists of 
almost bare, rounded hillocks about 60 feet higher than the level 
valley floor to the east, and with slopes of 25° or 30°; these hillocks 
constitute a narrow, but irregular belt across the valley somewhat 
convex downstream. The drift here consists of bowlders up to 6 
feet in diameter, some of which are well striated, mingled with sand 
and clay. The varieties of rock present include Telluride con- 
glomerate, quartzite and granite such as are contained in the 
Telluride conglomerate, sandstone both light-colored and red, and 
bowlders of the San Juan formation. Between this belt and the 
much higher, forest-covered morainal accumulation lying farther 
west than the mouth of Remine Creek, there is a depressed area 
occupied in part by ponds due to dams constructed by the Keystone 
Hydraulic Mining Company (Fig. 4). The second recessional 
moraine lying just east of Eder Creek consists of a much narrower, 
broken series of hillocks, likewise convex downstream. These 
hillocks are not more than ro to 20 feet higher than the general level 
of the valley bottom. Like the first recessional moraine described, 
this one has bowlders in variety; but here, with the exception of 
San Juan bowlders up to to feet in diameter, they are small. 
Lateral moraines along the San Miguel valley—south side.—From 
the low recessional moraine which lies east of the mouth of Remine 
Creek, a ridge of glacial drift extends eastward on the south side of 
the valley to Prospect Creek, a distance of half a mile. This ridge 
has an elevation of about 70 feet above the surface of the lacustrine 
plain forming the bottom of the valley, a height of crest above the 
depression to the south of not more than 20 feet at any point, and 
a width of from ro to 150 feet. This ridge constitutes the only 
well-marked lateral moraine belonging to the late recessional stages 
of ice in the San Miguel valley. 
