GLACIATION IN THE TELLURIDE QUADRANGLE 503 
Characteristics of the Deposits of Drift of the Earlier and the Later 
Epochs 
Extent of Glaciation 
In the More Recent Epoch 
In the Earlier Epoch or Epochs 
Age of the Drift 
More Recent Epoch 
Earlier Epoch or Epochs 
Post-glacial Changes 
Glaciation as Affecting the Location of Mining Claims 
PAR 
LOCATION AND EXTENT OF AREA 
The Telluride quadrangle, Colorado, lies in the southwestern 
part of the state about 60 miles from the western and 55 miles from 
the southern boundary. It is included between meridians 107° 45’ 
and 108° o’ west longitude, and parallels 37° 45’ and 38° o’ north 
latitude, having therefore a width of a little less than 14 miles, a 
length of a little more than 17 miles, and an area of over 235 square 
miles. 
DRAINAGE 
The greater part of the area of the quadrangle is drained by the 
San Miguel River, which flows northwest to join the Dolores, a 
‘tributary of Grand River; but the Uncompahgre River to the north, 
the Animas to the southeast, and headwaters of the Dolores to the 
southwest each receive some streams heading within this area; so 
that streams flow outward across the borders of the quadrangle 
toward practically all points of the compass, finally, however, to 
join their waters with those of the other tributaries of the Colorado 
River before reaching the sea. 
TOPOGRAPHY 
The chief topographic features of the quadrangle may be 
grouped under three heads, viz.: 
1. The rugged peaks and ridges in the eastern half of the area, a 
part of the San Juan Mountains. 
2. The isolated, loftier peaks of the Wilson group in the central 
part of the western half. 
