A group challenging the theory of a North American meteor-impact event some 12,900 years ago may have missed supporting evidence because they didn’t follow three critical protocols.
Not separating samples of the minuscule samples of iron- and silica-rich magnetic particles into like-sized groupings created an unnecessary layer of difficulty, says co-author Edward K. Vogel, a professor of psychology at the University of Oregon.
“The effects of such an impact would have been catastrophic on a global scale,” says co-author Barrett Rock, a botanist at the University of New Hampshire.
“On the order of 36 ice-age species became extinct, and the Clovis human culture eventually lost. All of this in response to dramatic changes in the vegetation at the base of the faunal food chain.”
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