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. 2020 Aug 14;10:13802. doi: 10.1038/s41598-020-68617-8

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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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Layer F. Bifaces and bifacial tools on limestone pebbles (1–6). Bifacial tool on a large chert nodule. Four bifaces on limestone and large chert nodules were found among the ten Large Cutting Tools (LCTs). The shaping of the bifaces covers a large part of the periphery and surface of the tool by one or several series of removals with retouches sometimes regularizing the cutting edges. The cross-sections are symmetrical or plano-convex. The base is frequently cortical. The support is a cobble or a large flake in limestone (n°1, 2, 5). The only exception is a tool on a large chert nodule available in situ (n°7). Some evidence of recycling is observed on the cutting edges (second series of small removals or retouches). Crushing marks on edges, due perhaps to percussion, are sometimes visible. Detailed descriptions are given in the Supplementary data. (Photos M-H. Moncel, C. Santagata).