GLACIATION IN THE TELLURIDE QUADRANGLE 623 
cliff bank is precipitous. This deposit extends for a distance of 
about 30 rods along the stream, and is interpreted as a recessional 
moraine. At its maximum, the ice in this valley extended to the 
point where the East and the West forks join, at an elevation of 
about 8,800 feet. The narrow tongue of ice in which this glacier 
terminated built a lateral moraine 150 to 200 feet in height and 
three-fourths of a mile long on the south side of this stream from 
Fic. 8.—Rock stream northeast of Gilpin Peak at elevation 12,300 feet. Looking 
east from col at 13,000 feet. Lake partially hidden from view is in a rock basin. 
Potosi Peak (outside the Telluride quadrangle) is at center in the background. 
elevation 9,500 feet to the west side of the West Fork, where 
bowlders in variety, some of them striated, mark the farthest 
extent of the ice. On the point between the two forks is an accumu- 
lation of glacial débris below the unglaciated point, and on the 
eastward-facing slope of the East Fork for half a mile above the 
junction, glacial débris is abundant; above about 9,500 feet in 
elevation the surface is covered for the most part with talus from 
