College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97330.
Oregon Glaciers Institute, Corvallis, OR 97330.
Proc Natl Acad Sci U S A. 2022 Apr 5;119(14):e2118558119. doi: 10.1073/pnas.2118558119. Epub 2022 Mar 21.
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.
意义
无冰走廊（IFC）长期以来一直是关于美洲人类迁徙假说的关键。早期对其年龄的评估表明，IFC 可供克洛维斯人首次迁徙使用，但随后的发展表明，在 IFC 开放之前，美洲已经有了克洛维斯人之前的人类居住，因此支持了一条太平洋沿海迁徙路线。然而，IFC 现有年龄的巨大不确定性并不能排除其作为首次迁徙路线的可能性。解决这一迁徙路线的争议对于回答第一批美国人何时以及如何到达的问题非常重要。我们报告的宇宙成因核素暴露年龄表明，IFC 的最终开放发生在克洛维斯人之前的人类居住之后。
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