geological "black layer" in north america indicates major event roughly 12,000 years ago, that triggered last ice age. also caused major die off on north american continent. more info, in addition to above link. http://www.pnas.org/content/104/41/16016.full.pdf

geological "black layer" in north america indicates major event roughly 12,000 years ago, that triggered last ice age. also caused major die off on north american continent. more info, in addition to above link. http://www.pnas.org/content/104/41/16016.full.pdf

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