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Originally Posted by Dean
Unless I am mistaken, the Sierras are tectonic in origin, not volcanic. Not to say we don't have geothermal springs and vents, but I think the volcanos tend to be more solitary at weak points in the plates rather than where they ram together. Shasta and the 4 up north, Bachelor, Hood, St Helens, and ?Rainier?
Don't know about Mammoth. I would have said it was part of te Sierras, not volcanic, but don't know it's history.
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Dean you sound interested in this sort of thing. If so, you should drive down 395 to the mamoth area. There are a ton of dormant and extinct volcanoes down there and a self guided tour along 395 that explains the evolution of that area. Mammoth ski area is actually a young semi-active volcano. They had to evacuate the ski area a few years back because she was making some noise and letting off steam.