United States West Thumb Geyser Basin (WTGB) Gen

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Lewis Kemper

About this spot
West Thumb Geyser Basin is one of the most picturesque basins in the park, situated on the shore of Yellowstone Lake. West Thumb is a large bay on Yellowstone Lake, created by a caldera (a large volcanic crater, formed by a major eruption leading to the collapse of the mouth of the volcano) that erupted approximately 150,000 years ago (125,000-200,000). The caldera later filled with water and became an extension of Yellowstone Lake. Technically it is a caldera in the larger Yellowstone Caldera which formed 600,000 years ago and created most of the park. There are many thermal features found here as well as Yellowstone Lake. This guide details 8 Spots in this area worthy of your attention.

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Essential Information


This spot appears in 1 guide.