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Thursday, November 11, 2021

Older dates vs. a later peopling of America Round 1


Ben Potter and James Chatters don't like the proof that is slowly building up supporting an early peopling of America. They wrote two separate papers decrying two papers that support the notion of an early peopling of America.


One (Ben A. Potter, James C. Chatters, et al. (2021) Current Understanding of the Earliest Human Occupations in the Americas: Evaluation of Becerra-Valdivia and Higham (2020), PaleoAmerica, DOI: 10.1080/20555563.2021.1978721) questions the findings of Lorena Becerra and Thomas Valdivia (Becerra-Valdivia, L., Higham, T. The timing and effect of the earliest human arrivals in North America. Nature 584, 93–97 (2020). https://doi.org/10.1038/s41586-020-2491-6).


Becerra and Valdivia analyzed data regarding the date of human entry to America and concluded that "The data obtained show that humans were probably present before, during and immediately after the Last Glacial Maximum (about 26.5–19 thousand years ago)."


Becerra wrote a rebuttal countering Potter and Chatters stating that "it is clear that they (Potter & Chatters) do not understand fully the methodology...As radiocarbon dating experts, it is sadly not uncommon for us to encounter: (i) academics who dismiss dates they view as incongruent with their expectations..." and conclude that "we note with interest a recent publication that has found further robust evidence for human activity (well-dated footprints) in North America at the time of the LGM (Bennett et al. 2021). This fits well within the chronology-centered peopling model we proposed (Becerra-Valdivia and Higham 2020). In the future, we hypothesize that new discoveries such as this one will strengthen the > 16,000 cal yr BP cultural signal in the continent."


Potter and Chatters' second paper against an early peopling of America ( James C. Chatters, Ben A. Potter, et al. (2021) Evaluating Claims of Early Human Occupation at Chiquihuite Cave, Mexico, PaleoAmerica, DOI: 10.1080/20555563.2021.1940441) attacks the finding of ancient stone tools in a cave in Mexico, surmising that they are geofacts (not man made).


The authors of the original paper Ardelean, Ciprian F., Lorena Becerra-Valdivia, et al. 2020. “Evidence of Human Occupation in Mexico around the Last Glacial Maximum.” Nature 584: 87092. doi:https://doi.org/10.1038/s41586-020-2509-0.) promptly replied. And something that drew my attention was this article, that tells us that "It's important to point out that Chatters and his colleagues didn't inspect the items gathered in Chiquihuite Cave first-hand, and instead relied "on the evidence provided in the original article and supporting documentation"." sort of "armchair detective" science job!.

It will take a lot of effort to overcome the old-school orthodoxy, but new discoveries will silence this kind of opposition.


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