Figure 3
From: Taphonomic and technological analyses of Lower Palaeolithic bone tools from Clacton-on-Sea, UK

Bovid metatarsal (NHMUK PV M 15260) used as a knapping hammer in dorsal (a), medial (b), plantar (c) and lateral (d) view. The area of battering on the dorsal face is bounded by the dashed line, and the circles indicate the points of impact that detached flakes of bone from the proximal end. The cut-mark is indicated by the white line.