GLACIATION IN THE TELLURIDE QUADRANGLE GENT 
generally present a fresh, unweathered appearance; undrained 
depressions in morainal tracts are still numerous; and streams have 
cut channels in bed rock not more than 10 to 20 feet in depth in the 
more favorable locations. 
GLACIATION AS AFFECTING THE LOCATION OF MINING CLAIMS 
_ Itis reported that the first prospectors in this region found some 
exceptionally large fragments of ore-bearing rock on the lower 
slopes of valleys now known to have been glaciated; small fragments 
are still occasionally met with. In a few cases it seems that these 
fragments have been taken to be an indication of an outcrop of 
a vein near by, and considerable effort has been expended in 
driving tunnels into the underlying bed rock in search of the ore 
body from which the fragments came. It should be remembered, 
however, that if fragments of ore-bearing rock are found on the 
surface within the area shown to have been glaciated, they have 
little value as indicating that the parent vein or ledge is near at 
hand. This is particularly true of those parts of valleys in which 
moraines are found; fragments found in the upper parts of valleys 
which are comparatively free from débris are more likely to be but 
a short distance from the outcrop of the body of ore. But the 
general rule is nevertheless in all cases to be recognized, that frag- 
ments found on the surface in any part of a glaciated area may have 
been derived from a ledge close at hand, or may have been brought 
from any point in any part of the valley above. 
