[1] Univ Poitiers, CNRS, EP 1596, Lab Ggeobiol Biochronol & Paleontol Humaine, F-86022 Poitiers, France
[2] CNAR, Ndjamena, Chad
[3] Univ Paris 06, CNRS, UMR 162, Biogeochim Isotop Lab, F-75252 Paris, France
[4] Coll France, Chaire Paleoanthropol & Prehist, F-75005 Paris, France
[5] Univ Complutense, Fac Ceincias Geol, Dept Palaeontol, E-28040 Madrid, Spain
[6] MNHN, CNRS, URA 12, Inst Paleontol, F-75005 Paris, France
[7] MNHN, Lab Mammiferes & Oiseaux, F-75005 Paris, France
[8] Univ Strasbourg 1, CNRS, UMR 7517, Ctr Geochim Surface, F-67084 Strasbourg, France
[9] Univ Lyon 1, CNRS, Ctr Sci Terre, UMR 5565, F-69622 Lyon, France
[10] IRESCO, CNRS, EP 1781, F-75017 Paris, France
[11] DRGM, Ndjamena, Chad
[12] Aristotle Univ Thessaloniki, Dept Geol & Phys Geog, GR-54006 Thessaloniki, Greece
[13] Univ Djamena, Ndjamena, Chad
[14] Boston Univ, Dept Anthropol, Boston, MA 02215 USA
[15] Univ Montpellier 2, EPHE, Inst Sci evolut, F-34095 Montpellier 05, France
[16] Univ Montpellier 2, CNRS, UMR 5554, F-34095 Montpellier 05, France
[17] Harvard Univ, Dept Anthropol, Cambridge, MA 02138 USA
[18] Univ Witwatersrand, Sch Med, PaleoAnthropol Res Grp, ZA-2193 Johannesburg, South Africa