608 4 ALLEN DAVID HOLE 
basins tributary to Bridal Veil Creek, the action of the ice was less 
vigorous. It is like other basins, however, in its flattened profile, 
in its increased width above the point where it joins the main valley, 
and in its precipitous bounding walls rising above considerable 
accumulations of talus. The thickness of ice here was probably 
from 100 to 300 feet. 
VALLEY OF BEAR CREEK 
This valley is double headed, and ice from both heads and from 
La Junta basin on the east united to form the Bear Creek Glacier, 
about four miles in length. The gradient of the valley, especially 
toward its head, is steep, locally as much as 1,000 feet per mile. 
The descent is by a series of precipices. Seen from below (lee 
side), say from the mill of the Nellie Mine, the valley shows little 
evidence of glaciation; but seen from above (stoss side), the pro- 
jecting bosses of rock, and the lower slopes of the valley are obviously 
smoothed and worn; striae parallel with the course of the valley 
occur at 9,000 feet elevation. The narrow, deep valley below the 
upper tributaries is in contrast with the wider and more open basins 
above. The thickness of the ice which occupied this valley was, at 
the maximum, more than 1,000 feet. | 
BASIN EAST OF SAN JOAQUIN RIDGE 
The westward-facing slope of Wasatch Mountain shows much 
talus, and the effect of the ice action is not conspicuous. The 
eastern part of the basin shows rounded domes of rock of the gen- 
eral form of roches moutonnées, but their surfaces are covered with 
broken rock, and positive signs of glaciation are not evident. 
Farther west, near the San Joaquin ridge, there are distinct signs 
of glaciation in the form of roches moutonnées, and several ponds in 
rock basins. The eastern face of the San Joaquin ridge indicates 
that the thickness of the ice here was not less than 300 feet. The 
serrate crest of the ridge is in striking contrast with the topography 
below. 
LENA BASIN 
Both this basin and its counterpart just west of the base of the 
San Joaquin ridge are glacial cirques. Both show roches moutonnées 
