180) J. LeConte—Ancient Glaciers of the Sierra Nevada. 
for several miles, I found, everywhere, over the lip of the 
precipice, over the whole floor of the cafion, and up the sides 
1,000 feet or more, the most perfect glaciation. 
There cannot, therefore, be the slightest doubt that this also 
is the pathway of a glacier which once ran into Lake Tahoe. 
After coming down its steep rocky bed, this glacier precipitated 
itself over the cliff, scooped out the lake at its foot, and then 
ran on until it bathed its snout in the waters of Lake Tahoe, 
