Nanodiamonds in the Younger Dryas boundary sediment layer.

  title={Nanodiamonds in the Younger Dryas boundary sediment layer.},
  author={Douglas J. Kennett and James P. Kennett and Allen West and Chris Mercer and Shane S. Que Hee and Lee Bement and Ted E. Bunch and M Sellers and Wendy S. Wolbach},
  volume={323 5910},
We report abundant nanodiamonds in sediments dating to 12.9 +/- 0.1 thousand calendar years before the present at multiple locations across North America. Selected area electron diffraction patterns reveal two diamond allotropes in this boundary layer but not above or below that interval. Cubic diamonds form under high temperature-pressure regimes, and n-diamonds also require extraordinary conditions, well outside the range of Earth's typical surficial processes but common to cosmic impacts. N… CONTINUE READING
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