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== == The Caldera itself was formed about 28Ma years ago, however the Dotsero

Volcano last erupted about 4100 years ago which is not that long in the geographical scheme of things. So although there are no outward signs

of volcanism, the odds are that there is some heat down there somewhere,

as we learned last year from the Four Peaked volcano in Alaska that had not erupted in 10,000+ years came to life.

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16y ago

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