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| A small rock glacier exists in the bowl-shaped valley between Wheeler Peak and Jeff Davis Peak. A rock glacier is a slow-miving acculumation of loose rock, ice, snow, mud, and water that creeps and slides down the mountain, averaging a rate of a few inches per day. The rocky surface of the rock glacier can be seen at the base of the bowl-shaped glacially carved valley. Geomorphic features suggest that a much more extensive alpine glacier existed here during the maximum extent of the last glaciation period (the Wisconsin Stage which peaked about 18,000 to 20,000 years ago). Evidence of a much large glacier is also depicted by several moraine-dammed lakes in the valley around the base of Wheeler Peak, and the extensive deposits of glacial till that extend down Lehman Creek valley. Moraines of an earlier glaciation period are also preserved in the park. |
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