Yellowstone could erupt more frequently than previously thought

Sciencemag.orgreports that the supervolcano beneath Yellowstone National Parkin Wyoming recorded its last catastrophic eruption some 630,000 years ago,, forming a caldera that nearly spans the park’s width and belching a thick layer of ash, or tephra,  > across North America. But rather than a single event,Yellowstone may have erupted twice in a span of 270 years, new evidence from mud cores discovered off the coast of Santa Barbara, California,indicates.