J. LeConte—Ancient Glaciers of the Sierras. 331 
which originated and from which emerged the Tuolumne glacier. 
rom the immense mass of snow accumulated here, the glacier 
poured its icy flood down the Tuolumne meadows to Soda 
Springs, where, joined by other tributaries, the swollen stream 
overflowed its banks and poured a portion of its flood over the 
divide into the Tenaya cation, while the greater portion went 
down the Tuolumne valley to, and beyond Hetch-hetchy; how 
far is not known. As the Glacial period passed away, the point 
of the Tuolumne glacier receded again, leaving terminal mo- 
raines here and there in the course of its retreat. When the 
case of the snow-remnant of the main branch of the uolumne 
glacier in the Mt. Lyell amphitheater, true glacial motion still 
ues. 
The evidences of this important fact are abundant. The 
whole irregular amphitheater formed by Mt. Lyell, Mt. McClure 
and other unnamed summits, is not now filled with snow, but 
only the more sheltered coves. One of these, viz., that formed by 
in contact with it, there is as 
pertect a terminal moraine as 
TAT WW 
the terminal moraine below. Some of these could be traced in 
lines to points of the cliff which have contributed in greater 
abundance, 
