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  _4047802.JPG - Garry explains here that we know the age of Yosemite Valley's initial cutting by using a lava flow that was bisected by the canyon. The lava was 9-10myo. Yosemite cut through that lava, which makes the valley YOUNGER than the lava. That is, Yosemite is no older than 10 million years old.  
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 Garry explains here that we know the age of Yosemite Valley's initial cutting by using a lava flow that was bisected by the canyon. The lava was 9-10myo. Yosemite cut through that lava, which makes the valley YOUNGER than the lava. That is, Yosemite is no older than 10 million years old.
Date: 4/4/09 11:31 AM | Keywords: MJC Geology Yosemite
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