Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay
As the ice retreated up Yosemite Valley, a lake formed between the glacier and its end moraine. San and silt were deposited on the lake bottom to a depth of a couple of hundred feet, giving the valley a square bottom instead of the rounded U shape typical of most glacial valleys.
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Created 25 November 2005, Last Update 15 January 2020