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. 2022 May 17;13:2557. doi: 10.1038/s41467-022-29923-z

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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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Fig. 1 — a Aerial view of the site. The red circle indicates the entrance of Tam Ngu Hao 2 cave. b Stratigraphy and sampling locations of the infilling of the cave, showing Lithological Unit 1 and 2 (LU1 and LU2) with the erosional interface between these layers indicated by a dashed red line; Micromorphological (microstratigraphic) samples (MM1 and MM2) are also shown. Encircled numbers denote approximate positions of photographs in c, d and e. c View of the flowstone capping the upper remaining part of LU2. d Detail of the arenitic breccia/conglomerate of LU2. e Detail of the arenitic silty clay of LU1.