The West Yellowstone rhyolite lava flow is located along Highway 20 (between the West Entrance of Yellowstone National Park and Madison Junction). The flow is approximately 111,000 years old and ...

In geology, even small layers can tell big stories. But figuring out the origins of such small layers can be a challenge, ...

This photo provided by the Korea Heritage Service (KHS) on July 15, 2025, shows that the “Rhyolitic Breccia Field at Mosewat, ...

Yellowstone National Park's geological history is one of the most intensely studied in North America. A new geologic unit ...

Obsidian lava flows are found worldwide, near volcanoes that erupt rhyolite and other lava rich in silica. In the United States, obsidian flows are in Oregon and California.

Yellowstone Supervolcano Had Eruptive Episodes With 'Highly Clustered' Lava Flows Published May 08, 2019 at 6:45 AM EDT Updated May 08, 2019 at 12:17 PM EDT By ...

You don’t have to travel to Hawaii or Iceland to find a record-breaking volcano – one of Earth’s largest and youngest ...