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 ...

Beneath the steaming geysers and bubbling mud pots of Yellowstone National Park lies one of the world’s most closely watched volcanic systems. Now a team of geoscientists has uncovered new evidence ...

Scientists sample water from the Firehole River in Yellowstone National Park. The work was done under National Park Service research permit 5194. (Courtesy of the Yellowstone Caldera Chronicles) ...