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. 2020 Jul 21;10:12053. doi: 10.1038/s41598-020-68839-w

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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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Microphotographs showing the characteristics of the main microfacies detected in sample ID # 60 where the combustion residues are affected by water action. (a) Microfacies 2; matrix composed of ‘clotted’ calcite (C) with sparitic calcite formed by dripping water infilling voids (V) (indicated by red arrow). PPL. (b) Microfacies 3; modified planar and complex voids (V). PPL. (c) Microfacies 3; charcoal dots dispersed in the matrix. PPL. (d) Microfacies 4; laminated coating above the cemented calcite (indicated by red arrows). PPL. (e) Microfacies 5; sub-rounded bone fragment (B), pale brown in PPL. (f) Microfacies 8; phosphate nodules from degraded coprolite fragments (indicated by red arrows) and sub-rounded vesicle (V) indicative of cold conditions. PPL.