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. 2020 Jun 2;11:2770. doi: 10.1038/s41467-020-16502-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Location of Hall’s Cave in North America, with the continental ice sheets and mountain glaciers shown at 18,000 and 9000 cal BP⁶⁵. b Left panel, sample ages at Hall’s Cave for bulk-bone samples (circles) and sediment samples (triangles) based on calibrated ages (ka cal BP). Middle panel, ambient temperature over Greenland based on δ¹⁸O values, dated by counting annual accumulation layers (years before Y2k; Greenland Ice Sheet Project 2—GISP2¹⁴). Right panel, time period sectioning.