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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. The Bridge River Ash was created when Mount Meager 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]
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