[1] Univ Michigan, Dept Anthropol, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Museum Paleontol, Ann Arbor, MI 48109 USA
[3] Univ Calgary, Dept Anthropol & Archaeol, Calgary, AB T2N 1N4, Canada
[4] Berkeley Geochronol Ctr, Berkeley, CA 94709 USA
[5] Makerere Univ, Dept Zool Entomol & Fisheries Sci, Kampala, Uganda
[6] Minist Tourism Wildlife & Antiqu, Uganda Natl Museum, Dept Museums & Monuments, Kampala, Uganda
[7] SUNY Stony Brook, Dept Anthropol, Stony Brook, NY 11794 USA
[8] Baylor Univ, Dept Geosci, Waco, TX 76798 USA
[9] Univ Minnesota, Dept Earth & Environm Sci, Minneapolis, MN 55455 USA
[10] Arizona State Univ, Inst Human Origins, Sch Human Evolut & Social Change, Tempe, AZ 85281 USA
[11] Tacoma Community Coll, Dept Social Sci, Tacoma, WA 98466 USA
[12] Natl Museums Kenya, Earth Sci Dept, Nairobi, Kenya
[13] Max Planck Inst Geoanthropol, D-07743 Jena, Germany
[14] Smithsonian Inst, Human Origins Program, Natl Museum Nat Hist, Washington, DC 20013 USA
[15] James Madison Univ, Dept Geol & Environm Sci, Harrisonburg, VA 22807 USA
[16] Univ Minnesota, Dept Anthropol, Minneapolis, MN 55455 USA
[17] Aix Marseille Univ, Coll France, CEREGE, CNRS,IRD,INRAE, Aix En Provence, France
[18] Univ Washington, Dept Biol, Seattle, WA 98195 USA
[19] Univ Washington, Burke Museum Nat Hist & Culture, Seattle, WA 98195 USA
[20] Columbia Univ, Div Biol & Paleo Environm, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
[21] Southern Methodist Univ, Roy M Huffington Dept Earth Sci, Dallas, TX 75275 USA
[22] Univ Texas Southwestern Med Ctr Dallas, Dept Surg, Sect Anat, Dallas, TX 75390 USA