Dating method glaciation

Absolute age limits were obtained for two of the Pleistocene glaciations by radiometric dating of basalt flows interfingered with the moraines.Three of the recognized glaciations, probably corresponding to the Matthes, Recess Peak, and Hilgard neoglaciations found by J. Birman in the central Sierra Nevada, occurred during the Holocene Epoch.

During the Quaternary Period the southeastern Sierra Nevada was characterized by the down-faulting of Owens Valley along two zones, one a series of normal faults along the range front (Independence Fault) and the other a series of faults along the center of the valley (Owens Valley fault zone).lakes were rare; one (Sawmill Meadow) was completely sedimented.Granitic boulders in the moraines were largely unweathered.Traces of at least seven glaciations were found during this study.Moraines and other deposits left during these glaciations could be distinguished based on the degree of weathering of granitic clasts, vegetative cover, and morphologic characteristics.

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Elevations within the study area ranged from about 1000 m (Owens Valley) to about 4000 m (peaks along the crest).

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