Fig. 1
From: When was silcrete heat treatment invented in South Africa?
Photos of analysed Lithic pieces from Hoedjiespunt (a–d and g) and Duinefontein 2 (e and f). a coarse-grained silcrete from Hoedjiespunt excluded from this study. b Heat-treated artefact entirely covered by smooth post-heating scars. c Heat-treated artefact with a heat-induced non-conchoidal (HINC) fracture surface (artificially darkened for better recognition in this photo). Note the scalar features indicted by the black arrow. d Heat-treated artefact with a remnant rougher pre-heating scar (artificially darkened for better recognition in this photo) that is cross-cut by smoother post-heating scars. e–g Unheated artefacts entirely covered by rough pre-heating scars.
