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. 2021 Sep 22;7(39):eabi8620. doi: 10.1126/sciadv.abi8620

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 6. — (1A and B and 2A) Polish. Scale bars, 1 mm (1 and 2); 500 μm (1, A and B, and 2A). (3A and 4A) Possible modifications from the inner surface. Scale bars, 1 mm (3 and 4); 500 μm (3A and 4A). (5A&B and 6A) Red ochre residue. Scale bars, 1 mm (5 and 6); 500 μm (5A and 6A); 250 μm (5B). Photo credit: A. Bouzouggar, INSAP, Morocco.