More geological changes are occurring at Yellowstone National Park, as another hole forms in one of the park's basins.

The dominant rock type in the Yellowstone region is rhyolite, and that is very rich in silica. As hot water circulates underground, it can dissolve that silica and bring it to the surface, where it is ...

USGS geologists discovered something odd in Yellowstone National Park: a massive new hole in the ground that's filled with steaming hot water.

Get ready for a little Christmas in July: There’s a new baby blue pool in Yellowstone National Park, and science suggests it started forming on the winter holiday.

Yellowstone National Park geologists identified a new thermal feature in Norris Geyser Basin. It may have coincided with a ...

The caldera is the enormous volcanic crater left from the last time Yellowstone experienced a giant eruption, 640,000 years ago. It covers an area about 30 by 45 miles.

The Elliott's Crater explosion occurred 8,000 years ago and produced a 700-m (2,300-ft) wide crater. The crater is fully submerged underwater, and no deposits from the explosion are exposed on land.

On occasion they get much bigger: The largest known crater from a hydrothermal explosion on Earth is in Yellowstone and measures 1.5 miles (2.4 kilometers) across, Poland said.

Scientists theorize that a series of hydrothermal explosions created that crater some 13,800 years ago in the Mary Bay area on the northeastern side of Yellowstone Lake.By comparison, the crater ...

Scientists theorize that a series of hydrothermal explosions created that crater some 13,800 years ago in the Mary Bay area on the northeastern side of Yellowstone Lake. By comparison, the crater ...