Old Supervolcanoes Give Yellowstone Clues
The Discovery Channel explores the geo-history of supervolcanoes:
Clues to past and future mega-eruptions of North America's biggest volcanoes are being unearthed just miles from Yellowstone National Park.
An hour's drive southwest of Yellowstone is a place geologists call the Heise Volcanic Field. Heise is the most recently deceased ancestor in a 400-mile-long line of seven supervolcanoes, stretching from Yellowstone southwest to the Nevada-Idaho state line, near McDermitt, Nevada.
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