The paper about Gault site in TX, USA was published back in 2018. And it provides evidence of an early presence of humans in that area 16 to 20.000 years ago.
The authors show that stone tools that were dated by optically stimulated luminescence and the dates obtained are "~16 to 20 thousand years ago" they therefore suggest that this indicates "an early human occupation in North America before at least ~16 thousand years ago. Significantly, this assemblage exhibits a previously unknown, early projectile point technology unrelated to Clovis. Within a wider context, this evidence suggests that Clovis technology spread across an already regionalized, indigenous population." Therefore the Clovis people were not the first.
Source: Thomas J. Williams, Michael B. Collins, Kathleen Rodrigues, William Jack Rink, Nancy Velchoff, Amanda Keen-Zebert, Anastasia Gilmer, Charles D. Frederick, Sergio J. Ayala, Elton R. Prewitt. Evidence of an early projectile point technology in North America at the Gault Site, Texas, USA. Science Advances, 2018; 4 (7): eaar5954 DOI: 10.1126/sciadv.aar5954
The authors unearthed stone tools that were fashioned using a technology that was distinct from the later Clovis tool technology, and is unique in America. They are old "from 21.7 ± 1.4 ka to 16.7 ± 1.1 ka." The paper concludes that "Gault Site demonstrates the presence of a previously unknown projectile point technology in North America before ~16 ka."
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