West Thumb of Yellowstone Lake and Geyser Basin

"West Thumb's shorline has suspiciously crater-like contours. Its underwater profile is dramatically deeper than the rest of Yellowstone Lake. Only a massive explosion could have formed West Thumb. Though the blowout occurred 125,000 year ago, West Thumb is still thermally active. Hot springs, mud pots, and geysers steam and percolate along the shore, and temperature gauges record high heat flow in lake bottom sediments. This bay is a crater within a crater -- created by a volcanic eruption and violent collapse within the larger, earlier Yellowstone caldera." (quote from sign at West Thumb) 

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