Photographs of Upper Geyser Basin, Yellowstone National Park

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Scalloped Spring, enclosing a sunken pool of dark water

The unusual, sunken appearance of Scalloped Spring results from illegal attempts to force an eruption several decades ago; now the waters bubble and boil several feet below ground level, mostly hidden by a thick, overhanging, scalloped sinter rim. The feature is not a geyser and the waters never rise above the rim.

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Keywords: Yellowstone National Park, Upper Geyser Basin, Wyoming, thermal features, geysers, hot springs, hot pools, boiling water

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