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
• High Resolution Photo Available