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mk · 5057 days ago · link · · parent · post: Evidence in Canadian Arctic points to volcanoes as cause of mass extinction 250M years ago.
Wikipedia entry that disputes the volcanism possibility: http://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinc... I guess the newer article has evidence that the eruption was much greater in size than previously thought.
I remember a couple of years ago, Yellowstone had a string of quakes. That caldera is still rising... :/