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Younger Dryas deposits
Vertical Dark layer, the “black mat,” comprises carbon-rich sediments at the bottom of Younger Dryas deposits. Below: A mammoth tooth from underneath the Younger Dryas layer in Arizona is stained on top by the black mat. YDB Working Group | Horizontal Dark layer, the “black mat,” comprises carbon-rich sediments at the bottom of Younger Dryas deposits. Below: A mammoth tooth from underneath the Younger Dryas layer in Arizona is stained on top by the black mat. YDB Working Group | Thumb Dark layer, the “black mat,” comprises carbon-rich sediments at the bottom of Younger Dryas deposits. Below: A mammoth tooth from underneath the Younger Dryas layer in Arizona is stained on top by the black mat. YDB Working Group |
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