White volcanic ash layer which marks major volcanic eruption. This layer is known as the White River Ash and was formed from a super eruption of Mount Churchill in about 650 A.D. Mount Churchill is located close to Mt. St. Elias.

Image ID: line5242, NOAA's America's Coastlines Collection
Location: Canada, Yukon Territory
Photo Date: 2010 September
Photographer: Dr. John Cloud, NOAA Central Library


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