Fig 1.
A Basalt cleaver with distal dorsal configuration resulting from a flake scar remnant.
GBY#9896, Layer JB.
Fig 2.
A minimally modified Kombewa basalt cleaver.
GBY#100, Layer II-6 Level 4.
Fig 3.
Three basalt cleavers modified by delineation; top: GBY#5906, Layer II-6 Level 3; middle GBY#5976, Layer V-5; bottom: GBY#13765, Layer II-6 Level1.
Fig 4.
A basalt cleaver modified by delineation (#13763 Layer II-6 Level 3) showing the main features discussed in the text.
(A) Invasive retouch covering the majority of the dorsal surface; (B) The flat delineated surface; (C) The working edge; (D) The acute angle formed by the intersection between the delineated dorsal and unmodified ventral faces; (E) The triangular shape formed by the delineated surface.
Table 1.
The distribution of dorsal distal modification types across the different blank types for the GBY cleavers (excluding indeterminate).