The White River Ash is a 1,500-year-old tephra deposit found in the southern part of the Yukon Territory, Canada and eastern Alaska. [1] The deposit is bilobate, [2] formed by two large ( VEI 6) explosive eruptions from the stratovolcano of Mount Churchill that occurred around 850 AD and blanketed 340,000 km2 (130,000 sq mi). [3] While originally believed to only exist within North America, recent observations (2014) have found crypto-tephra from the eruption across northern Europe.
The White River Ash is a 1,500-year-old tephra deposit found in the southern part of the Yukon Territory, Canada and eastern Alaska. [1] The deposit is bilobate, [2] formed by two large ( VEI 6) explosive eruptions from the stratovolcano of Mount Churchill that occurred around 850 AD and blanketed 340,000 km2 (130,000 sq mi). [3] While originally believed to only exist within North America, recent observations (2014) have found crypto-tephra from the eruption across northern Europe.