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A Long-Standing Division in Yellowstone's Volcanic Record Questioned

Since the 1960s, geologists have divided the Lava Creek Tuff into two separate units. These units are called member A and member B. This volcanic rock layer was left behind 631,000 years ago. It came from the massive eruption that formed Yellowstone Caldera, a giant volcanic crater. The layer holds more than 1,000 cubic kilometres, or 240 cubic miles, of…

Rewritten with AI from facts reported by USGS. Read the original for the full report.