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Old faithful is a geyser in Yellowstone National Park which erupts on a regular schedule, as ground water seeps into heated rock below the surface. It was first seen by European Americans in 1870. It has likely existed (although not necessarily with the same eruptive time) for several hundred years.

It is part of the Upper Geyser Basin of Yellowstone, which formed sometime after the last glaciation of the region some 14,000 years ago.

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9y ago

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