Yellowstone spawned twin super-eruptions that altered global climate
Two layers of volcanic ash bearing the unique chemical fingerprint of Yellowstone’s most recent super-eruption have been found in seafloor sediments in the Santa Barbara Basin, off the coast of Southern California. These layers of ash, or tephra, are sandwiched among sediments that contain a remarkably detailed record of ocean and climate change. Together, both the ash and sediments reveal that the last eruption was not a single event, but two closely spaced eruptions that tapped the brakes on a natural global-warming trend that eventually led the planet out of a major ice age.
https://www.heritagedaily.com/2017/10/yellowstone-spawned-twin-super-eruptions-altered-global-climate/117192
