Figure 6
Texture analysis. Boxplots illustrating the variability in textural parameters Ymax (a), Sq (b), AsFc (c), Spc (d), Smr1 (e), and Sal (f) on experimental double-beveled tools used, from left to right, in debarking southern African trees, digging in dry sediment and humus-rich soil, and processing rabbit skin with/without ochre, and on ethnographic debarkers as well as on unworn and worn archaeological specimens found at the Sibudu site. Vertical dashed lines separate tools used on different tree species, types of sediment, and presence/absence of ochre mixture for processing rabbit pelt. Numbers on experimental tools indicate length of use in minutes. Horizontal colored bands highlight the range of variability at 1σ for each experimental function (debarking in yellow, digging in sediment in grey, processing pelt in red) after 20 min of use. Mixed colors indicate overlap between ranges. BC = Border Cave.
