Extended Data Fig. 7: Bladelet-like chert piece with a bone fragment attached (no. 129).
From: Innovative ochre processing and tool use in China 40,000 years ago
(1) mosaic of the ventral face showing the location of the bone (3D DM). (2–4) detail of the bone film adhering to a layer of calcium carbonate (3D DM, SEM-LFD and SEM BSD respectively). (5) detail of the bone imprint (SEM-LFD). (6) calcium carbonate layer sandwiched between the bone and the tool surface (SEM-BSD). (7) EDX spectrum from the bone film taken in the center of images 3 and 4. (8–10) plant fiber imprints, present on both edges at the proximal end, associated with some ochre particles (3D DM, SEM-LFD and SEM-BSD respectively).
