Yellowstone

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 the gas phase.

Type/Process: Geothermal Activity
Volcanic Status: Tephrochronology
Image Number: 033-051
Photographer: Dan Dzurisin, 1983 (U.S. Geological Survey)
Summit Elevation: 2805 meters
Latitude/Longitude: 44.43 N / 110.67 W
Timeframe: Last known eruption B.C. (Holocene)
Region: Canada and Western USA