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Beacon Rock (WA), Boring Volcanic Field, is the central core of a c...

By Volcano Hazards Program
Beacon Rock (Washington), Boring Volcanic Field, is the central cor...
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Beacon Rock (Washington), Boring Volcanic Field, is the central core of a cinder cone that remained intact after its carapace was stripped away by the Missoula Floods about 15,000 years ago.