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. 2020 Jun 8;10:9225. doi: 10.1038/s41598-020-65903-3

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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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Flint cores belonging to bipolar-on-anvil flaking. 1,2: BLE cores showing two negative scars generated along the longitudinal axis from the pebble extremity in contact with the anvil. The opposite cortical extremity displays marks of percussion (n.1). 3–7: BPE cores showing a split surface along the transversal axis of the pebble and elongated peripheral negative scars. Percussion marks on the opposite cortical side are visible in core n. 3. Core n. 5 shows a split fracture along the longitudinal axis (photos and drawings by R. Gallotti). BLE: bipolar-on-anvil longitudinal exploitation. BPE: bipolar-on-anvil semi-peripheral exploitation.