Ancient "Supervolcano" Rocked Washington State

Ancient "Supervolcano" Rocked Washington State: "Ancient 'Supervolcano' Rocked Washington State
Richard A. Lovett
for National Geographic News
February 6, 2007

An ancient 'supervolcano' in what is now Washington State spewed steam and billowed ash in amounts that dwarf the eruption of Mount St. Helens in 1980, new research shows."