Yosemite National Park
Geology
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lasrus
From 20 to 5 million years ago, the area was a hotspot for volcanic activity.
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replied to:  lasrus
zapster
Replied to:  From 20 to 5 million years ago, the area was a...
A series of glaciations modified the region, starting about 3 million years ago and lasting until about 10,000 years ago.
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