Early explorers to Yellowstone described this features as a “most repulsive and terrifying site.” It is a volcano-like cone, 30 by 30 feet high and wide (9 x 9 m) with mud that erupts and covers tall trees. When Nathaniel P. Langford, the first superintendent of Yellowstone, visited in 1870, he saw “a seething, bubbling mass of mud.” It is likely a violent eruption blew out the cone’s side, leaving the crater you see today. The water constantly undercuts the back wall and is rich in iron sulfides.
At Madison Junction, you'll find a campground, restroom facilities, an information...
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