2009 Portland GSA Annual Meeting (18-21 October 2009)
Paper No. 234-4
Presentation Time: 9:00 AM-9:15 AM


SUROVELL, Todd A., Deparment of Anthropology, University of Wyoming, 1000 E. University Avenue, Dept. 3431, Laramie, WY 82071, surovell@uwyo.edu and HOLLIDAY, Vance T., Department of Geosciences, The University of Arizona, Gould-Simpson Bldg, Tucson, AZ 85721

Based on elevated concentrations of a series of impact markers at the onset of the Younger Dryas stadial from sedimentary contexts across North America, Firestone, Kennett, West, and others have argued that 12,900 years ago, the Earth experienced an impact by an extraterrestrial body, an event that had devastating ecological consequences for humans, plants, and animals in the New World. In this paper, we report the results of an independent analysis of two of their markers, magnetic minerals and microspherules, from seven sites of similar age including two examined by Firestone et al. We were unable to reproduce any results of the original Firestone et al. study and find no support for Younger Dryas extraterrestrial impact.

2009 Portland GSA Annual Meeting (18-21 October 2009)
General Information for this Meeting
Session No. 234
Impact Cratering from the Microscopic to the Planetary Scale II
Oregon Convention Center: A106
8:00 AM-12:00 PM, Wednesday, 21 October 2009

Geological Society of America Abstracts with Programs, Vol. 41, No. 7, p. 595

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