Rock varnish dating
Warren Beck, a University of Arizona geochemist and a lead author of the Science article.
Beck and colleagues found no coal or charcoal in rock varnish samples they collected and analysed to try to duplicate Dorn's work.
But in an interview last week, Arrowsmith denied that his article replicates Dorn's rock-varnish method.
Arrowsmith says he used a different technique to look for organic material in “the contents of cracks” in rocks, that no AMS dating tests were performed on the sample, and that he wasn't trained by Dorn to use his established method of dating rock varnish.
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