Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week’s contribution is from Mark Stelten, research geologist with ...

This photo shows the exposure of the Mount Jackson Rhyolite Series vitrophyre at Gibbon River. Boulders of weathered, lichen-covered rock show how easy it is to overlook these new units. (Photo by Liv ...

The sun sets over the Lamar Valley on July 9, 2024, at Yellowstone National Park. (Pat Sutphin for the Idaho Capital Sun) People visit Yellowstone National Park every year to observe its wildlife and ...

Obsidian is a naturally occurring volcanic glass that forms when viscous rhyolite magma, which is rich in silica, erupts as a lava flow then cools rapidly. The rapid cooling and high viscosity of the ...

09:36, Fri, Oct 27, 2023 Updated: 11:05, Fri, Oct 27, 2023 Small lava eruptions in the Yellowstone volcano caldera are “more dramatic” than was thought and occur in clusters — making then, while not ...