The age of the opening of the Ice-Free Corridor and implications for the peopling of the Americas-Reference-Cited by-同舟云学术

The age of the opening of the Ice-Free Corridor and implications for the peopling of the Americas

Published:2022-03-21 Issue:14 Volume:119 Page:
ISSN:0027-8424
Container-title:Proceedings of the National Academy of Sciences
language:en
Short-container-title:Proc. Natl. Acad. Sci. U.S.A.

Author:

Clark Jorie¹^ORCID,Carlson Anders E.²,Reyes Alberto V.³^ORCID,Carlson Elizabeth C. B.⁴,Guillaume Louise⁵^ORCID,Milne Glenn A.⁶,Tarasov Lev⁷,Caffee Marc⁸⁹^ORCID,Wilcken Klaus¹⁰^ORCID,Rood Dylan H.⁵^ORCID

Affiliation:

1. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97330

2. Oregon Glaciers Institute, Corvallis, OR 97330

3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada

4. Burpee Museum of Natural History, Rockford, IL 61103

5. Department of Earth Science and Engineering, Royal School of Mines, Imperial College London, London SW7 2AZ, United Kingdom

6. Department of Earth Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada

7. Department of Physics and Physical Oceanography, Memorial University, St. John’s, NL A1C 5S7, Canada

8. Department of Physics, Purdue University, West Lafayette, IN 47907

9. Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907

10. Australian Nuclear Science and Technology Organization, Lucas Heights, NSW, 2234, Australia

Abstract

SignificanceThe Ice-Free Corridor (IFC) has long played a key role in hypotheses about the peopling of the Americas. Earlier assessments of its age suggested that the IFC was available for a Clovis-first migration, but subsequent developments now suggest a pre-Clovis occupation of the Americas that occurred before the opening of the IFC, thus supporting a Pacific coastal migration route instead. However, large uncertainties in existing ages from the IFC cannot preclude its availability as a route for the first migrations. Resolving this debate over migration route is important for addressing the questions of when and how the first Americans arrived. We report cosmogenic nuclide exposure ages that show that the final opening of the IFC occurred well after pre-Clovis occupation.

Funder

National Science Foundation

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

Link

https://pnas.org/doi/pdf/10.1073/pnas.2118558119

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