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Yellowstone National Park
Eruptions
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About 16 million years ago, a series of volcanic eruptions began in what is now western Idaho and northern Nevada. About 2.1 million years ago another eruption occurred under the southwestern portion of Yellowstone. The volume of material ejected during this eruption is difficult to imagine; it is estimated to be 2,400 times the size of the 1980 Mount St. Helens explosion. (Illustration based on Smith, R. B., and Siegel, L., 2000, Windows into the Earth; New York, Oxford University Press.)
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Did You Know?
Lake trout are an invasive species of fish that is decimating the native cutthroat trout population in Yellowstone Lake.
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Last Updated: July 11, 2007 at 16:20 EST |
