Bridge River Ash
Map of the Bridge River Ash
The Bridge River Ash is a large geologically recent volcanic ash deposit that spans from southwestern British Columbia to central Alberta, Canada. The ash consists of dust-sized shards ellipsoidal fragments of pumice. It overlaps the Mount St. Helens Yn Ash and the Mazama Ash which were erupted from Mount St. Helens and Mount Mazama about 3,400 and 6,800 years ago.
Even though the name Bridge River Ash is consistent with the Bridge River Cones, the ash did not originate from these volcanoes. The Bridge River Ash was created when the Mount Meager massif erupted about 2,350 years ago as prevailing winds carried the ash east during eruption. This is the most recent major eruption in Canada.[1]
See also
References
- ↑ Volcanoes of Canada: Distribution of tephra deposits in Western North America Archived 2011-05-06 at WebCite Retrieved on 2007-11-29
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