Proto biface
Age approx. 1.76 Million Years Digital Capture: Photogrammetry

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This protobiface belongs to the oldest Early Acheulean known so far in East Africa and in the world. It is made on a large flat cobble of phonolite (L= 235mm, W=132mm, T= 55mm). The two faces have been flaked successively to give a pointed shape to one extremity of the tool, but large natural surfaces (cortex) remain. Two different techniques have been applied to shape this large bifacial piece : percussion on passive hammer and hand held direct percussion.

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