FIG. 7. — A, B in The shell industry in Final Neolithic societies in Sardinia: characterizing the production and utilization of Glycymeris da Costa, 1778 valves

FIG. 7. — A, B, experimental shell surface used to process clay with the dorsal face of valves (smoothing; 15 minutes); C, D, experimental shell surface used to process clay with the edge of valves (smoothing; 15 minutes); E-G, experimental shell surface used to process clay with the dorsal face of valves (smoothing; 1 month). Scale bars: 100 µm.