Lobby > Exhibits > Hot Water Treasures > Monument Geyser Basin

Located south of Gibbon Meadows, this small geyser basin is one of the strangest spots in the park. Although the basin has no active geysers, its “monuments” are made of siliceous sinter and appear very similar to the siliceous spires found on the floor of Yellowstone Lake. Scientists think that this basin’s structures formed from a hydrothermal system in a glacially dammed lake during the last stages of the Pinedale Glaciation.

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