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Global Volcanism Program | Image GVP-03351

A small mudpot vent in Pocket Basin at the north end of Yellowstone's Lower Geyser Basin produced this intriguing feature that mimics a spatter cone that issued a lava flow. Mudpots form in areas of intense, clay-rich hydrothermal alteration where the thermal system is dominated by gases. Photo by Dan Dzurisin, 1983 (U.S. Geological Survey).

A small mudpot vent in Pocket Basin at the north end of Yellowstone's Lower Geyser Basin produced this intriguing feature that mimics a spatter cone that issued a lava flow. Mudpots form in areas of intense, clay-rich hydrothermal alteration where the thermal system is dominated by gases.

Photo by Dan Dzurisin, 1983 (U.S. Geological Survey).

Keywords: geothermal features | geothermal | mud pool


Yellowstone