Topic: Members of the 1870 Washburn Expedition named Mud Volcano for the cone-shaped mud that covered the feature when they first saw it. By 1872 a thermal explosion had blown that mud away to reveal what we see today.
2 minutes 04 seconds
Written & Presented By:
Park Ranger George Heinz
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Last Updated:
Thursday, 21-Feb-2008 22:34:27 Eastern Standard Time
http://www.nps.gov
/archive/yell/insideyellowstone/0025mudvolcano.htm