636 ALLEN DAVID HOLE 
In the valley of the East Dolores northeast of Flat Top Moun- 
tain drift is abundant on both sides for half a mile or more above 
the junction of the two branches. Farther upstream, on the west 
side, the surface is almost wholly covered with talus from the 
precipitous outcropping igneous rock. On the east side drift is 
found near the stream below the outcropping cliff face, and in 
places on the more level area above the outcrop. The westward- 
facing slope for more than a quarter of a mile above the boundary 
as determined for the more recent stage of glaciation contains 
evidence of the presence of ice of an earlier epoch. The line of 
division between these two areas is, however, drawn somewhat 
arbitrarily, its position being determined in part by a comparison 
of the elevations of the limit of recent glaciation at points respec- 
tively farther up and farther down the valley. As finally deter- 
mined the line represents approximately the line of division between 
abundant drift on the surface (recent epoch) and occasional, 
disconnected patches of drift (earlier epoch). 
The drift hills near the junction of the two branches are, in 
general, irregular in arrangement, and less prominent below the 
junction than above. On the north side, however, at 9,900 feet 
elevation, a distinct lateral moraine occurs extending for 40 rods 
in a northeast-southwest direction. Lower down on the slope at 
9,700 to 9,800 feet elevation is another fragment of a morainic ridge 
parallel to the one first named. These ridges are distinguished as 
morainal from somewhat similar ridges and terraces farther up the 
slope which are due to landsliding, chiefly by their composition, 
but also by their greater length and regularity. The lower limit 
of extent of the ice is marked only by small accumulations of 
drift on the somewhat steep slope. Below this point valley train 
deposits occur west of the mouth of Kilpacker Creek and again at 
various points on the south side of the stream up to 30 feet above 
the bottom of the valley. 
The maximum thickness of ice in the valley of the East Dolores 
was probably about 500 feet. 
VALLEY WEST OF GRIZZLY PEAK 
That part of the head of the cirque lying northwest of Grizzly 
Peak on the north side of the stream presents the same features as 
