Add Yahoo as a preferred source to see more of our stories on Google. he Mount Jackson Rhyolite Series vitrophyre at Gibbon River This photo shows the exposure of the Mount Jackson Rhyolite Series ...

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 ...

Kenneth Sims and other research scientists recently discovered that mafic volcanism of Henrys Fork Caldera, which is located in eastern Idaho and west of Yellowstone National Park, occurred ...