Extended Data Figure 8: Distribution of resin and red ochre material on stone artefacts and gypsum analysis.
From: Cultural innovation and megafauna interaction in the early settlement of arid Australia
Aa, Resin adhering to the medial arris ridge that runs the length of the dorsal surface at 215× magnification in plane (pp, left) and cross polarized (xp, right). Scale bar, 0.2 mm. Ab, Resin with carbonized inclusions and associated hafting polish 500× darkfield. Scale bar, 20 μm. Ac, Ocre grains within the worked margin; 50× darkfield. Scale bar, 100 μm. Ad, Worked ochre grains; 500× brightfield cross polarized. Scale bar, 20.0 μm. Ba, Spheres of gypsum lying in situ within excavated square 4C, Warratyi rock shelter. Bb, Scanning electron microscope image of gypsum from Warratyi rock shelter. The sample consisted of very fine-grained clear gypsum-cleavage plates, mostly sub-equidimensional to slightly tabular and 5–10 μm across. There are occasional larger tabular–acicular (needle-like) fragments up to 100 μm long. Scattered through the gypsum are well-rounded, sub-spherical silt-sized grains of quartz 50–75 μm across, generally reddish in colour. Scale bar, 1 μm.
