Yosemite Valley, California at Maximum Advance of the Glaciers
Steven Dutch, Natural and Applied Sciences, University
of Wisconsin - Green Bay
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Early ice advances during the Pleistocene nearly filled the valley because we find isolated boulders, or erratics, dropped by the ice on mountain tops high above the valley. The most recent advance, however, got down to the western end of the valley and stopped. The glaciers planed away the rock wall of the valley, probably triggering landslides that further eroded the valley walls. At its end, the glacier left a ridge of debris called a moraine, although it's difficult to distinguish the moraine itself from debris dropped later by rockfalls and avalanches. Further east, the high Sierra were completely covered in ice with only the highest summits exposed.
- Yosemite Valley, California
- Yosemite Valley, California During Retreat of the Glaciers
- Yosemite Valley, California During Uplift of the Sierra Nevada
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Created 25 November 2005, Last Update 14 December 2009
Not an official UW Green Bay site