Newly discovered fossil footprints show that humans were present in North America between ~23,000 and 21,000 years ago during the Last Glacial Maximum, according to recent research in Science.
Views and conclusions are those of the authors and do not necessarily reflect policies of the National Park Service . Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US government. Research at WHSA was conducted under a permit issued to D.O. .M.R.B. acknowledges Natural Environment Research Council grants . V.T.H. acknowledges the Argonaut Archaeological Research Fund . Funding for J.S.P. and K.B.S.
thank the Western National Parks Association for support.M.R.B., D.B., T.M.U., D.O., and S.C.R. conceptualized the project, were responsible for its management and resource acquisition, and did the fieldwork along with J.S.P. and K.B.S., who designed and led the stratigraphic analysis and radiocarbon dating. C.C., V.L.S., and P.J.M. provided field support, and J.S.H. and A.M.H. provided laboratory support. M.B. wrote several of the algorithms used in the footprint analysis. V.T.H. and B.F.
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