Early Acheulian & Developed OldowanB / w)oldtkbiffig87&88

Bifaces. TK Upper Occupation Floor, Upper Bed II, Olduvai Gorge (c. 1.15-1.3 MYA). (Left) Large biface made of tabular quartzite, 25.7 cm (10 in.) in length; (Right) Small bifaces, the two center are of lava, the three right are quartz. each of the small bifaces at right is 6 or 6.5 cm (about 2.5 in.). TK Upper is an Oldowan B industry as is MNK Main in preceding image.

Photo © Leakey, M. (1971). Olduvai Gorge, Vol. 3. Cambridge: At the University Press: fig. 87 and 88.