Yellowstone spawned twin super-eruptions that altered global
climate, Geological Society of America, October 26, 2017
https://www.sciencedaily.com/releases/2017/10/171026085804.htm
http://www.geosociety.org/GSA/News/Releases/GSA/News/pr/2017/17-60.aspx
Santa Barbara Basin Sediment Record of Volcanic Winters
Triggered by Two Yellowstone Supervolcano Eruptions at 639 ka
https://gsa.confex.com/gsa/2017AM/webprogram/Paper306169.html
Yours,
Paul H.