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. 2019 Dec 16;9:19193. doi: 10.1038/s41598-019-55422-1

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© The Author(s) 2019

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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Plots showing radioisotopic dating results for the study pot sediments. (a) Total and supported ²¹⁰Pb (as ²¹⁴Pb) and ¹³⁷Cs activity for the upper sediments. (b) Comparison of IntCal13 and SHCal13 calibrations for the herbaceous stem fragment recovered from the basal sediment. The black bar beneath each curve represents the relative area under the (2σ) probability distribution.