Imagine a towering column of mud, spewing water much like a geyser high into the surrounding trees. That is what this puddle of bubbling, smelly mud used to look like before it blew itself apart in the 1870's. The geothermal features of Yellowstone are always changing, coming and going, building and dissolving, and Mud Volcano is no different. Now, instead of a volcano we get a boiling cauldron of sticky mud that smells exactly like rotten eggs due to the high concentration of hydrogen sulfide gas rising from the magma chambers not-so-deep beneath the surface of the Yellowstone Caldera. I can't wait to go back to Yellowstone (maybe not quite as long next time, 15 years is too much) and see what else might have changed in the time I've been away.
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