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 ...

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 ...

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 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 ...

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 ...

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 ...

Left: A Yellowstone National Park team member uses a long grabber pole to remove a park map, presumably blown from a visitor's hand or pack by the wind, from a thermal feature. Right: A Yellowstone ...