Citation

Comment on “DNA from Pre-Clovis Human Coprolites in Oregon, North America”.
Poinar Hendrik N., Stuart Fiedel, Kirsti Bos, Chrsitine E. King, Alison M. Devault, Melanie Kuch, & Régis Debruyne.
Science 2009, 325(5937):148.
DOI: 10.1126/science.1168182

Abstract

Gilbert et al. (Reports, 9 May 2008, p. 786) analyzed DNA from radiocarbon-dated paleofecal remains from Paisley Cave, Oregon, which ostensibly demonstrate a human presence in North America predating the well-established Clovis complex. We question the authenticity of their DNA results and argue that in the absence of intact stratigraphy and diagnostic artifacts, and in view of carbon isotope anomalies, the radiocarbon dates of the oldest specimens are unreliable.

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Further reading

Access the response to our comment by  Gilbert, MTP et al., Science, 2009 325:148. Have fun…
Read also the comment by Goldberg et al. on “DNA from Pre-Clovis Human Coprolites in Oregon, North America”. And make your own conclusions.