Scientists have found previously undocumented ash deposits buried beneath the Lava Creek Tuff in Wyoming — and at least one of them could be from an unknown volcanic eruption, they say.

The ash deposits were buried beneath the Lava Creek Tuff, a large, white-ish mass of compacted volcanic ash formed from the last giant Yellowstone eruption 631,000 years ago. The origins of the ...

Scientists in Wyoming have discovered evidence of two mysterious volcanic eruptions that are older than the last caldera-forming supereruption at Yellowstone. The ash deposits were buried beneath ...