The Grand Canyon of the Yellowstone is the first large canyon on the Yellowstone River downstream from Yellowstone Falls in Yellowstone National Park. The canyon is approximately 24 miles long, between 800 feet (244m) and 1,200 feet (366m) deep and between one quarter of a mile (.45 km) and three quarters of a mile (1.2 km) wide.
Read more about Grand Canyon Of The Yellowstone: History, Geology
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... The specifics of the geology of the canyon are not well understood, except that it is an erosional feature rather than the result of glaciation ... After the Yellowstone Caldera eruption of about 600,000 years ago, the area was covered by a series of lava flows ... The site of the present canyon, as well as any previous canyons, was probably the result of this uplift and related faulting, which allowed erosion ...
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