1. School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, 2050 South Africa e-mail: Dominic.Stratford@wits.ac.za
2. Institute of Human Origins, School of Human Evolution and Social Change, Arizona State University, P.O. Box 874101, Tempe, AZ 85287, USA e-mail: kerstin.braun@mail.huji.ac.il
3. School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, 2050 South Africa e-mail: Peter.Morrissey@students.wits.ac.za