1. Earth Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
2. Department of Anthropology, University of Illinois, Urbana, IL 61801, USA.
3. CEREGE (UMR6635 CNRS/Université Aix-Marseille), BP80, F-13545 Aix-en-Provence Cedex 4, France.
4. Center for Bio-Archaeology and Ecology (UMR5059 CNRS/Université Montpellier 2/EPHE), Institut de Botanique, F-34090 Montpellier, France.
5. Department of Geology, Miami University, Oxford, OH 45056, USA.
6. Department of Anthropology, Stanford University, Stanford, CA 94305, USA.
7. Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada.
8. Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA, and Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA.
9. Université Paris-Ouest La Défense, Centre Henri Elhaï, 200 Avenue de la République, 92001 Nanterre, France.
10. Paleobiology, Canadian Museum of Nature, Ottawa, Ontario K1P 6P4, Canada.
11. Human Evolution Research Center and Department of Integrative Biology, 3101 Valley Life Sciences Building, University of California, Berkeley, CA 94720, USA.