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Grand Canyon of the Yellowstone

Yellowstone National Park

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ADDED: Jul 13, 2005 19:56VIEWS: 5,392
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Grand Canyon of the YellowstoneGrand Canyon of the Yellowstone >
Grand Canyon of the Yellowstone
This view of the Grand Canyon of the Yellowstone is from below Lower Falls, looking downstream. The splendid yellow-brown walls of the canyon consist predominantly of rhyolite tuff and lava (Sulfur Creek Tuff and Canyon flow, respectively), which erupted nearly 500,000 years ago. Both units have been intensely altered by hydrothermal fluids


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