[1] Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Schlossgarten 5, D-91054 Erlangen, Germany
[2] Univ Liverpool, Dept Earth Ocean & Ecol Sci, Brownlow St, Liverpool L69 3GP, Merseyside, England
[3] Stone Age Inst, Bloomington, IN 47407 USA
[4] Univ Barcelona, Catalan Inst Res & Adv Studies ICREA, Res Grp Archaeometry & Archaeol ERAAUB, Dept Prehist Ancient Hist & Archaeol, C Montalegre 6-8, Barcelona 08001, Spain
[5] Univ Witwatersrand, Evolutionary Studies Inst, P Bag 3, ZA-2050 Johannesburg, South Africa
[6] Univ Witwatersrand, Sch Geosci, P Bag 3, ZA-2050 Johannesburg, South Africa
[7] Colorado State Univ, Dept Anthropol, Ft Collins, CO 80523 USA
[8] Indiana Univ, Dept Geol Sci, 1001 East 10th St, Bloomington, IN 47405 USA
[9] Univ Dar Es Salaam, Dept Hist, Archaeol Unit, Dar Es Salaam, Tanzania