lasrus
From 20 to 5 million years ago, the area was a hotspot for volcanic activity.
Yosemite National Park
Geology
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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.