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News Release 08-148
Yellowstone's Ancient Supervolcano: Only Lukewarm?
Molten plume of material beneath Yellowstone cooler than expected
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![Photo of a geyser in Yellowstone National Park.](/news/mmg/media/images/yellowstone1_f.jpg)
Yellowstone National Park and its famous geysers are the remnants of an ancient supervolcano.
Credit: U.S. Geological Survey
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![Topography of Yellowstone National Park showing the volcano's caldera, or sunken floor.](/news/mmg/media/images/yellowstone2_f.jpg)
The Yellowstone volcano's caldera, or sunken floor, covers an immense area.
Credit: U.S. Geological Survey
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