1 Center for the Advanced Study of Human Paleobiology, Department of Anthropology, The George Washington University, Washington, DC 20052; david_braun@gwu.edu.
2 Department of Human Evolution, Max Planck Institute of Evolutionary Anthropology, 04103 Leipzig, Germany.
3 Interdisciplinary Center for Archaeology and the Evolution of Human Behaviour, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
4 Archaeology Department, University of Cape Town, 7701 Rondebosch, South Africa.
5 School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287.
6 Department of Archaeology and Heritage Management, Main Campus, Addis Ababa University, Addis Ababa, Ethiopia.
7 Institute of Human Origins, School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85287.
8 Berkeley Geochronology Center, Berkeley, CA 94709.
9 Department of Geosciences, Pennsylvania State University, University Park, PA 16802.
10 CNRS, Géosciences Rennes-UMR 6118, University of Rennes, F-35000 Rennes, France.
11 Department of Earth and Environmental Science, Potsdam University, 14476 Potsdam-Golm, Germany.
12 Authority for Research and Conservation of Cultural Heritage, Addis Ababa, Ethiopia.
13 University of Laboratoire Paléontologie Évolution Paléoécosystémes Paléoprimatologie (UMR 7262), Université de Poitiers, Poitiers, France.
14 Center for the Advanced Study of Human Paleobiology, Department of Anthropology, The George Washington University, Washington, DC 20052.
15 Department of Biology, University of North Georgia, Dahlonega, GA 30533.
16 Department of Anthropology, Yale University, New Haven, CT 06511.