1 School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Private Bag 3, WITS 2050, South Africa; Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, WITS 2050, South Africa. Electronic address: Dominic.Stratford@wits.ac.za.
2 Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, WITS 2050, South Africa; Department of Biology, Birmingham-Southern College, Birmingham, AL, 35254, USA; Plio-Pleistocene Palaeontology Section, Department of Vertebrates, Ditsong National Museum of Natural History (Transvaal Museum), Pretoria, South Africa.
3 Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, WITS 2050, South Africa; Plio-Pleistocene Palaeontology Section, Department of Vertebrates, Ditsong National Museum of Natural History (Transvaal Museum), Pretoria, South Africa; Department of Anthropology, University of Wisconsin, Madison, WI, 53706, USA.
4 Center for Anthropological Research, University of Johannesburg, Auckland Park, 2095, South Africa.
5 School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Private Bag 3, WITS 2050, South Africa.