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Silcrete heat treatment was the earliest known transformative process enhancing the mechanical properties of materials. Its study has implications for our understanding of the cultural evolution of early humans in the Middle Stone Age and southern Africa. Here, we analyze a silcrete assemblage from the South African site Klein Kliphuis. We first investigate the relative prevalence of heat treatment in assemblage and then the position of heat treatment within reduction sequences. We found that ∼60% of all silcrete was heat-treated prior to knapping in one post-Howiesons Poort assemblage and â...

Head to the mountains above Clanwilliam to a rugged expanse, where the winding Pakhuis Pass leads.

We explore the correspondence between changing palaeoenvironments, patterns of site use, and lithic technology at the rock shelter site Klein Kliphuis (South Africa) across the interval 65–55 000 years before present. This period coincides with the termination of Marine Isotope Stage (MIS) 4, and the disappearance of an iconic late Pleistocene archaeological unit known as the Howiesons Poort. Wood charcoals indicate sufficient soil moisture around Klein Kliphuis throughout the Howiesons Poort to support diverse tree species at a time when site occupation was relatively intense. At least some...