1. Department of Geosciences, Baylor University, Waco, TX 76798, USA.
2. Department of Anthropology and Archaeology, University of Calgary, Calgary, AB T2N 1N4, Canada.
3. Berkeley Geochronology Center, Berkeley, CA 94709, USA.
4. Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, USA.
5. Department of Anthropology, University of Michigan, Ann Arbor, MI 48109, USA.
6. Department of Earth Sciences, National Museums of Kenya, Nairobi 00100, Kenya.
7. Max Planck Institute for Geoanthropology, D-07743 Jena, Germany.
8. Human Origins Program, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA.
9. Department of Geology & Environmental Science, James Madison University, Harrisonburg, VA 22807, USA.
10. Museum of Paleontology, University of Michigan, Ann Arbor, MI 48109, USA.
11. CEREGE, Aix-Marseille Université, CNRS, IRD, Collège de France, INRAE, 13545 Aix en Provence, France.
12. Department of Biology, Burke Museum of Natural History and Culture, University of Washington, Seattle, WA 98195, USA.
13. Department of Anthropology, University of Minnesota, Minneapolis, MN 55455, USA.
14. Department of Earth Sciences, Tennessee Tech University, Cookeville, TN 38505, USA.
15. Roy M. Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX 75275, USA.
16. Department of Social Sciences, Tacoma Community College, Tacoma, WA 98466, USA.
17. Department of Zoology Entomology and Fisheries Sciences, Makerere University, Kampala, Uganda.
18. Department Messel Research and Mammalogy, Senckenberg Research Institute and Natural History Museum, 60325 Frankfurt, Germany.
19. Department of Anthropology, Wake Forest University, Winston-Salem, NC 27109, USA.
20. Uganda National Museum, Department of Museums and Monuments, Ministry of Tourism, Wildlife and Antiquities, Kampala, Uganda.
21. Turkana Basin Institute, Stony Brook University, Stony Brook, NY 11794, USA.
22. Department of Anthropology, Stony Brook University, Stony Brook, NY 11794, USA.
23. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA.
24. Ocean Sciences Department, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.
25. Department of Biomedical Sciences, Heritage College of Osteopathic Medicine, and Ohio Center for Ecological and Evolutionary Studies, Ohio University, Athens, OH 45701, USA.
26. Division of Biology and Paleo Environment, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.