1
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Bison, elk, wolves, bears, oh my!

2
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We're here in Hayden Valley in Yellowstone National Park.

3
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We don't care about the wildlife, we're about the geology.

4
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And the geologic story here is spectacular.

5
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We're in Yellowstone Caldera.

6
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It's the depression that formed about 631,000 years ago

7
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when the last huge eruption of the Yellowstone region occurred.