Its western moraine lies partly against a rocky ridge which runs down to Lake Tahoe to form Rubicon Point.

At the head of the bay, as at the head of Cascade Lake, there is a cliff about 100 feet high, over which the river precipitates itself and forms a beautiful cascade.

Over the lip of this cliff, and in the bed of the canyon above, and up the sides of the cliff-like walls, 1000 feet or more, the most perfect glaciation is found.

The only difference between this glacier and the two preceding is, that it ran more deeply into the main lake and the deposits dropped in its retreat did not rise high enough to cut off its little rock basin from that lake, but exists now only as a _shallow bar_ at the mouth of the bay.

This bar consists of _true moraine matter_, i.e., intermingled bowlders and sand, which may be examined through the exquisitely transparent water almost as perfectly as if no water were present.
All that I have described separately and in detail, and much more, may be taken in at one view from the top of Mount Tallac.