UNITED STATES OF AMERICA
Wyoming
YELLOWSTONE NATIONAL PARK
The "Yellowstone Travels" Trip
Mud Volcano
Monday November 1st, 2004
The Washburn Expedition and the Hayden Survey discovered Mud Volcano during the early 1870s.
Both groups heard the sound "resembling the reports of distant artillery" for several miles before arriving at Mud Volcano, which at that time exploded with mud from its hillside alcove. Since then Mud Volcano has quieted but still remains a bubbling, seething spring.
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