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. 2022 Dec 7;612(7939):283–291. doi: 10.1038/s41586-022-05453-y

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© The Author(s) 2022

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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Extended Data Fig. 1 — Type locality 50 indicating units in formation b. Overview locality 74a+b with a complete sediment sequence. C. Overview of locality 69. D. Detail of organic rich sediment in unit B3 before excavation and cleaning for ancient eDNA samples. E. Sampling in the permafrost within unit B3 at locality 50. F. Organic rich sediment at the base of mega-scale cross-bedding within unit B2 at locality 74a+b. White circles mark persons for scale.