Horrible Today: 2nd Eruption Geyser Basin in Yellowstone park Hot Spring! Raining Mud Recorded Live

Horrible Today: 2nd Eruption Geyser Basin in Yellowstone park Hot Spring! Raining Mud Recorded Live

Visitors to Yellowstone who enter or leave the park using the north entrance, near Mammoth Hot Springs, have probably passed by Roaring Mountain. It is located about 5 miles north of Norris Geyser Basin and is home to a number of steaming, hissing fumaroles (gas vents) on the side of a treeless, barren hill right along the eastern edge of the Norris-Mammoth road.

Roaring Mountain is a classic example of an acid-sulfate thermal area. No geysers are present on Roaring Mountain; rather, the surface is dotted with numerous steam and gas vents. The gases that are emitted are at or above boiling temperatures for that elevation, and their acidic nature has caused much of the rock in the area, which is densely welded ash erupted during the caldera-forming event that created Yellowstone caldera, to become altered into clay minerals, especially kaolinite and smectite.