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Evidence from central Mexico supporting the Younger Dryas extraterrestrial impact hypothesis

  1. Wendy S. Wolbachn
  1. aDepartamento de Geología y Mineralogía, Edif. U-4. Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicólas de Hidalgo, C. P. 58060, Morelia, Michoacán, México;
  2. bUS Geological Survey, Menlo Park, CA, 94025;
  3. cFacultad de Biología, Universidad Michoacana de San Nicólas Hidalgo C. P. 58060, Morelia, Michoacán, México;
  4. dDepartment of Geosciences, National Taiwan University, Taipei 106, Taiwan, Republic of China;
  5. eSRI International, Menlo Park, CA 94025;
  6. fGeology Program, School of Earth Science and Environmental Sustainability, Northern Arizona University, Flagstaff AZ 86011;
  7. gWyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138;
  8. hLawrence Berkeley National Laboratory, Berkeley, CA 94720;
  9. IGeoScience Consulting, Dewey, AZ 86327;
  10. jDepartment of Earth Science and Marine Science Institute, University of California, Santa Barbara, CA 93106;
  11. kNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan;
  12. lCAMCOR High Resolution and MicroAnalytical Facilities, University of Oregon, Eugene, OR 97403;
  13. mMaterials Science Institute, University of Oregon, Eugene, Oregon 97403; and
  14. nDepartment of Chemistry, DePaul University, Chicago, IL 60614
  1. Fig. P1.

    Images of (A) a nanodiamond, (B) magnetic spherule, and (C) carbon spherule. The graphs below show peak abundances in nanodiamonds (ppb), magnetic spherules (no./kg), carbon spherules (no./kg), and charcoal (no./kg) at or close to onset of the YD (2.8?m; 12,900?BP). Younger Dryas episode marked by gray band and arrows.

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