Fig 9. 1, 2, 6, 7: centripetal/tangential cores; 3–5: flakes with centripetal/tangential negative scars on the dorsal face.

Obsidian. 1, 6, 7: drawings by M. Pennacchioni; 2–5: technological schemes by R. Gallotti. 6, 7: these drawings have been modified after 34. They have been rearranged and integrated with new ones in this Figure, which is for illustrative purposes only.