White River Ash

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.

  1. ^ Lerbekmo, J. F.; Campbell, F. A. (February 1969). "Distribution, composition, and source of the White River Ash, Yukon Territory". Canadian Journal of Earth Sciences. 6 (1): 109–116. doi:10.1139/e69-011. ISSN 0008-4077.
  2. ^ Lerbekmo, J. F.; Campbell, F. A. (February 1969). "Distribution, composition, and source of the White River Ash, Yukon Territory". Canadian Journal of Earth Sciences. 6 (1): 109–116. doi:10.1139/e69-011. ISSN 0008-4077.
  3. ^ West, K.D.; Donaldson, J.D. (2000). "Evidence for winter eruption of the White River Ash (eastern lobe), Yukon Territory". CGRG Bibliography of Canadian Geomorphology. The Canadian Geomorphology Research Group. Archived from the original on 2009-04-08. Retrieved 2007-07-09.