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 breathtaking beauty of Yellowstone National Park and its stunning hydrothermal features may have you exclaim: "Hold on to your hats!" The U.S. Geological Survey asks you to take that literally.

Yellowstone is a dynamic geologic system—the one constant is change. This is demonstrated daily by hydrothermal activity ...

Get any of our free daily email newsletters — news headlines, opinion, e-edition, obituaries and more. Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the ...

Yellowstone National Park draws more than 4 million visitors every year, and while most people leave behind only footprints, geologists working in the park end up collecting a surprising amount of ...

U of U geology professor Robert B. Smith has made a 50-year career out of studying Yellowstone. He presents a lecture on the Yellowstone Supervolcano Wednesday, March 18, at 7:30 p.m. at the Skaggs ...

Yellowstone National Park remains the most visited park in the United States. Although the interest is great, millions of visitors can also hurt the park's well-being. We have seen several examples of ...

For years, public imagination has fixated on Yellowstone as the ultimate natural doomsday machine, a supervolcano waiting to ...

28 July 2026 – 5 days for US$4,995* per person (*based on 2025 prices, subject to increase). Step into one of the most wildlife-rich landscapes in the continental US, the iconic Lamar valley of ...