A. K. Behrensmeyer, ATMOSPHERE: Climate Change and Human Evolution, Science, vol.311, issue.5760, pp.476-478, 2006.
DOI : 10.1126/science.1116051

L. R. Berger, D. J. De-ruiter, S. E. Churchill, P. Schmid, K. J. Carlson et al., Australopithecus sediba: A New Species of Homo-Like Australopith from South Africa, Science, vol.328, issue.5975, pp.195-204, 2010.
DOI : 10.1126/science.1184944

A. Brock and G. L. Isaac, Paleomagnetic stratigraphy and chronology of hominid-bearing sediments east of Lake Rudolf, Kenya, Nature, vol.19, issue.5440, pp.344-348, 1974.
DOI : 10.1038/247344a0

F. H. Brown and C. S. Feibel, Revision of lithostratigraphic nomenclature in the Koobi Fora region, Kenya, Journal of the Geological Society, vol.143, issue.2, pp.297-310, 1986.
DOI : 10.1144/gsjgs.143.2.0297

F. H. Brown and C. S. Feibel, Stratigraphy, depositional environments and paleogeography of the Koobi Fora Formation, Koobi Fora Research Project, 1991.

F. H. Brown and I. Mcdougall, Geochronology of the Turkana Depression of Northern Kenya and Southern Ethiopia, Evolutionary Anthropology: Issues, News, and Reviews, vol.30, issue.14, pp.217-227, 2011.
DOI : 10.1002/evan.20318

T. E. Cerling, Paleochemistry of plio-pleistocene lake Turkana, Kenya, Palaeogeography, Palaeoclimatology, Palaeoecology, vol.27, pp.247-285, 1979.
DOI : 10.1016/0031-0182(79)90105-6

F. H. Chamalaum and I. Mcdougall, Dating geomagnetic polarity epochs in Réunion, Nature, vol.210, pp.2012-2014, 1966.

J. E. Channell and Y. Guyodo, The Matuyama Chronozone at ODP Site 982 (Rockall Bank): Evidence for Decimeter-Scale Magnetization Lock-In Depths, AGU Geophysical Monograph Seminar Timescales of the Geomagnetic Field, pp.205-219, 2004.
DOI : 10.1029/145GM15

J. De-heinzelin, The Omo Group: Archives of the International Omo Research Expedition Musée Royal de L'Afrique Centrale Tervuren Plio-Pleistocene African climate Climate and human evolution, Annales Serie Science deMenocal, P.B. Science, vol.8, issue.331, pp.53-59, 1983.

G. Dupont-nivet, M. Sier, C. J. Campisano, J. R. Arrowsmith, E. Dimaggio et al., Magnetostratigraphy of the eastern Hadar Basin (Ledi-Geraru research area, Ethiopia) and implications for hominin paleoenvironments The geology of early humans in the Horn of Africa, Geol. Soc. Am. Special Paper, vol.446, pp.67-85, 2008.

S. Elton, L. C. Bishop, and B. Wood, Comparative context of Plio-Pleistocene hominin brain evolution, Journal of Human Evolution, vol.41, issue.1, pp.1-27, 2001.
DOI : 10.1006/jhev.2001.0475

C. S. Feibel, Freshwater stingrays from the Plio-Pleistocene of the Turkana Basin, Kenya and Ethiopia, Lethaia, vol.1926, issue.85, pp.359-366, 1993.
DOI : 10.2307/1443322

C. S. Feibel, Tephrostratigraphy and geological context in paleoanthropology, Evolutionary Anthropology: Issues, News, and Reviews, vol.107, issue.14, pp.87-100, 1999.
DOI : 10.1002/(SICI)1520-6505(1999)8:3<87::AID-EVAN4>3.0.CO;2-W

C. S. Feibel, A Geological History of the Turkana Basin, Evolutionary Anthropology: Issues, News, and Reviews, vol.3, issue.14, pp.206-216, 2011.
DOI : 10.1002/evan.20331

C. S. Feibel, F. H. Brown, and I. Mcdougall, Stratigraphic context of fossil hominids from the Omo group deposits: Northern Turkana Basin, Kenya and Ethiopia, American Journal of Physical Anthropology, vol.4, issue.4, pp.595-622, 1989.
DOI : 10.1002/ajpa.1330780412

C. S. Feibel, J. M. Harris, and F. H. Brown, Neogene paleoenvironments of the Turkana Basin, Koobi Fora Research Project, pp.321-370, 1991.

F. M. Gradstein, J. G. Ogg, M. Schmitz, and G. Ogg, The Geologic Timescale 2012, p.pp, 2012.

E. H. Harmon, The shape of the early hominin proximal femur, American Journal of Physical Anthropology, vol.46, issue.2, pp.154-71, 2009.
DOI : 10.1002/ajpa.20966

R. L. Hay, Geology of the Olduvai Gorge: a Study of Sedimentation in a Semiarid Basin, 1976.

J. W. Hillhouse, J. W. Ndombi, A. Cox, and A. Brock, Additional results on palaeomagnetic stratigraphy of the Koobi Fora Formation, east of Lake Turkana (Lake Rudolf), Kenya, Nature, vol.23, issue.5593, pp.411-415, 1977.
DOI : 10.1038/265411a0

C. Horng, M. Lee, H. Pälike, K. Wei, W. Liang et al., Astronomically calibrated ages for geomagnetic reversals within the Matuyama chron, Earth, Planets and Space, vol.8, issue.6, pp.679-690, 2002.
DOI : 10.1186/BF03351719

J. C. Joordens, H. B. Vonhof, C. S. Feibel, L. J. Lourens, G. Dupont-nivet et al., An astronomically-tuned climate framework for hominins in the Turkana Basin, Earth and Planetary Science Letters, vol.307, issue.1-2, pp.1-8, 2011.
DOI : 10.1016/j.epsl.2011.05.005
URL : https://hal.archives-ouvertes.fr/insu-00670840

J. C. Joordens, C. S. Feibel, F. Spoor, H. B. Vonhof, A. Schulp et al., A biogeographical model for hominin evolution in Africa between ~5 and 2.5 Ma, Abstract in Proceedings of the European Society for the study of Human Evolution, p.110, 2012.

T. Kidane, Y. Otofuji, F. H. Brown, K. Takemoto, and G. Eshete, Two normal paleomagnetic polarity intervals in the lower Matuyama Chron recorded in the Shungura Formation (Omo Valley, Southwest Ethiopia), Earth and Planetary Science Letters, vol.262, issue.1-2, pp.240-256, 2007.
DOI : 10.1016/j.epsl.2007.07.047

W. H. Kimbel, R. C. Walter, D. C. Johanson, K. E. Reed, J. L. Aronson et al., Late PlioceneHomoand Oldowan Tools from the Hadar Formation (Kada Hadar Member), Ethiopia, Late Pliocene Homo and Oldowan tools from the Hadar Formation (Kada Hadar Member), Ethiopia, pp.549-561, 1996.
DOI : 10.1006/jhev.1996.0079

C. Kindley, A. Macho, M. A. Tsegaye, J. M. Feinberg, B. S. Singer et al., Paleointensity and 40Ar/39Ar geochronology of basalts at Gamarri, Ethiopia: Correlation with the Reunion subchron and Huckleberry Ridge excursion? Abstract, pp.13-1128, 2012.

J. Kingdon, Lowly Origin: Where, When and Why Our Ancestors First Stood Up, 2003.

J. L. Kirschvink, The least-squares line and plane and the analysis of palaeomagnetic data, Geophysical Journal International, vol.62, issue.3, pp.699-718, 1980.
DOI : 10.1111/j.1365-246X.1980.tb02601.x

K. F. Kuiper, A. Deino, F. J. Hilgen, W. Krijgsman, P. R. Renne et al., Synchronizing Rock Clocks of Earth History, Science, vol.320, issue.5875, pp.500-504, 2008.
DOI : 10.1126/science.1154339

C. Laj and J. E. Channell, Geomagnetic Excursions, Geomagnetism, Treatise on Geophysics, pp.373-416, 2007.
DOI : 10.1016/B978-044452748-6/00095-X

M. A. Lanphere, D. E. Champion, R. L. Christiansen, G. A. Izett, and J. D. Obradovich, Revised ages for tuffs of the Yellowstone Plateau volcanic field: Assignment of the Huckleberry Ridge Tuff to a new geomagnetic polarity event, Geological Society of America Bulletin, vol.114, issue.5, pp.559-568, 2002.
DOI : 10.1130/0016-7606(2002)114<0559:RAFTOT>2.0.CO;2

J. Laskar, P. Robutel, F. Joutel, M. Gastineau, A. C. Correia et al., A long-term numerical solution for the insolation quatities of the Earth, Astron. Astrophys, vol.428, issue.1, pp.21-285, 2004.

M. G. Leakey, P. N. Gathogo, and N. G. Jablonski, Geological background and Cercopithecoid faunal assemblages The Fossil Monkeys. The California Academy of Sciences, Koobi Fora Research Project, pp.359-396, 2008.

M. G. Leakey, F. Spoor, M. C. Dean, C. S. Feibel, S. C. Antón et al., New fossils from Koobi Fora in northern Kenya confirm taxonomic diversity in early Homo, Nature, vol.169, issue.7410, pp.201-204, 2012.
DOI : 10.1038/nature11322

R. E. Leakey, Evidence for an Advanced Plio-Pleistocene Hominid from East Rudolf, Kenya, Nature, vol.168, issue.5398, pp.447-450, 1973.
DOI : 10.1038/242447a0

R. E. Leakey, Further Evidence of Lower Pleistocene Hominids from East Rudolf, North Kenya, 1972, Nature, vol.11, issue.5394, pp.170-173, 1972.
DOI : 10.1038/242170a0

R. E. Leakey, Further evidence of Lower Pleistocene hominids from East Rudolf, North Kenya, 1973, Nature, vol.265, issue.5450, pp.653-656, 1973.
DOI : 10.1038/248653a0

C. J. Lepre, R. L. Quinn, J. C. Joordens, C. C. Swisher, and C. S. Feibel, Plio-Pleistocene facies environments from the KBS Member, Koobi Fora Formation: implications for climate controls on the development of lake-margin hominin habitats in the northeast Turkana Basin (northwest Kenya), Journal of Human Evolution, vol.53, issue.5, pp.504-514, 2007.
DOI : 10.1016/j.jhevol.2007.01.015

C. J. Lepre, H. Roche, D. V. Kent, S. Harmand, R. L. Quinn et al., An earlier origin for the Acheulian, Nature, vol.62, issue.7362, pp.82-85, 2011.
DOI : 10.1038/nature10372
URL : https://hal.archives-ouvertes.fr/halshs-00654058

L. J. Lourens, A. Antonarakou, F. J. Hilgen, A. A. Van-hoof, C. Vergnaud-grazzini et al., Evaluation of the Plio-Pleistocene astronomical timescale, Paleoceanography, vol.107, issue.17, pp.391-413, 1996.
DOI : 10.1029/96PA01125

L. J. Lourens, F. J. Hilgen, N. J. Shackleton, J. Laskar, and D. Wilson, The Neogene period A geologic timescale, pp.409-430, 2004.

I. Mcdougall and F. H. Brown, Geochronology of the pre-KBS Tuff sequence, Omo Group, Turkana Basin, Journal of the Geological Society, vol.165, issue.2, pp.549-562, 2008.
DOI : 10.1144/0016-76492006-170

P. L. Mcfadden and M. W. Mcelhinny, The combined analysis of remagnetization circles and direct observations in palaeomagnetism, Earth and Planetary Science Letters, vol.87, issue.1-2, pp.161-172, 1988.
DOI : 10.1016/0012-821X(88)90072-6

P. L. Mcfadden and M. W. Mcelhinny, Classification of the reversal test in palaeomagnetism, Geophysical Journal International, vol.103, issue.3, pp.725-729, 1990.
DOI : 10.1111/j.1365-246X.1990.tb05683.x

R. Pickering, P. Dirks, Z. Jinnah, D. J. De-ruiter, S. E. Churchill et al., Australopithecus sediba at 1.977 Ma and Implications for the Origins of the Genus Homo, Science, vol.333, issue.6048, pp.1421-1423, 2011.
DOI : 10.1126/science.1203697

R. Potts, Evolution: Big brains explained, Nature, vol.333, issue.7375, pp.43-44, 2011.
DOI : 10.1038/480043a

X. Quidelleur, J. W. Holt, T. Salvany, and H. Bouquerel, New K-Ar ages from La Montagne massif, R??union Island (Indian Ocean), supporting two geomagnetic events in the time period 2.2-2.0 Ma, Geophysical Journal International, vol.182, issue.2, pp.699-710, 2010.
DOI : 10.1111/j.1365-246X.2010.04651.x

B. G. Richmond and W. L. Jungers, Orrorin tugenensis Femoral Morphology and the Evolution of Hominin Bipedalism, Science, vol.319, issue.5870, pp.1662-1665, 2008.
DOI : 10.1126/science.1154197

A. P. Roberts, Geomagnetic excursions: Knowns and unknowns, Geophysical Research Letters, vol.132, issue.B1, 2008.
DOI : 10.1029/2008GL034719
URL : http://hdl.handle.net/1885/17373

T. L. Spell and I. Mcdougall, Characterization and calibration of 40 Ar, p.39, 2003.

F. Spoor, M. G. Leakey, P. N. Gathogo, F. H. Brown, S. C. Antón et al., Implications of new early Homo fossils from Ileret, east of Lake Turkana, Kenya, Nature, vol.163, issue.7154, pp.688-691, 2007.
DOI : 10.1038/nature05986

F. Spoor, Palaeoanthropology: Malapa and the genus Homo, Nature, vol.103, issue.7367, pp.44-45, 2011.
DOI : 10.1038/478044a

G. Suwa, T. D. White, and F. C. Howell, Mandibular postcanine dentition from the Shungura Formation, Ethiopia: Crown morphology, taxonomic allocations, and Plio-Pleistocene hominid evolution, American Journal of Physical Anthropology, vol.95, issue.2, pp.247-282, 1996.
DOI : 10.1002/(SICI)1096-8644(199610)101:2<247::AID-AJPA9>3.0.CO;2-Z

M. R. Talbot, M. A. Williams, and D. A. Adamson, Strontium isotope evidence for late Pleistocene reestablishment of an integrated Nile drainage network, Geology, vol.28, issue.4, pp.343-346, 2000.
DOI : 10.1130/0091-7613(2000)28<343:SIEFLP>2.0.CO;2

R. Tiedemann, M. Sarnthein, and N. J. Shackleton, O and dust flux records of Ocean Drilling Program Site 659, Paleoceanography, vol.1, issue.36, pp.619-638, 1994.
DOI : 10.1029/94PA00208

E. Tuenter, S. L. Weber, F. J. Hilgen, and L. J. Lourens, The response of the African summer monsoon to remote and local forcing due to precession and obliquity, Global and Planetary Change, vol.36, issue.4, pp.219-235, 2003.
DOI : 10.1016/S0921-8181(02)00196-0

P. S. Ungar and M. Sponheimer, The Diets of Early Hominins, Science, vol.334, issue.6053, pp.190-193, 2011.
DOI : 10.1126/science.1207701

A. A. Van-hoof and C. G. Langereis, Reversal records in marine marls and delayed acquisition of remanent magnetization, Nature, vol.351, issue.6323, pp.223-225, 1991.
DOI : 10.1038/351223a0

H. B. Vonhof, F. P. Wesselingh, R. J. Kaandorp, G. R. Davies, J. E. Van-hinte et al., Paleogeography of Miocene Western Amazonia: Isotopic composition of molluscan shells constrains the influence of marine incursions, Geological Society of America Bulletin, vol.115, issue.8, pp.983-993, 2003.
DOI : 10.1130/B25058.1

H. B. Vonhof, J. C. Joordens, M. L. Noback, H. J. Van-der-lubbe, C. S. Feibel et al., Environmental and climatic control on seasonal stable isotope variation of freshwater molluscan bivalves in the Turkana Basin (Kenya), Palaeogeography, Palaeoclimatology, Palaeoecology, vol.383, issue.384, 2013.
DOI : 10.1016/j.palaeo.2013.04.022

P. Wang, J. Tian, and L. J. Lourens, Obscuring of long eccentricity cyclicity in Pleistocene oceanic carbon isotope records, Earth and Planetary Science Letters, vol.290, issue.3-4, pp.3-4, 2010.
DOI : 10.1016/j.epsl.2009.12.028

B. Wood, Koobi Fora Research Project, 1991.

B. Wood, Where Does the Genus Homo Begin, and How Would We Know? The First Humans ? Origin and Early Evolution of the Genus Homo, pp.17-28, 2009.

B. Wood and M. G. Leakey, The Omo-Turkana Basin Fossil Hominins and Their Contribution to Our Understanding of Human Evolution in Africa, Evolutionary Anthropology: Issues, News, and Reviews, vol.261, issue.6, pp.264-292, 2011.
DOI : 10.1002/evan.20335

. Lt and . Femur, partial tibia and fibula Homo sp. KBS-12m KBS-15m 1.95-1.98 (just (max ~ 30 cm) below base Olduvai chron

. Lt, P. Mandibular, and . Boisei, KBS-13m 1.95-1.98 (between base Olduvai chron and Pre-Olduvai event) 62000 Partial cranium Homo sp KBS-21m 1, pp.95-96

H. Mandibular and . Sp, GPC- 1.98-2.09 (between Pre-Olduvai event and age KNM-ER 1470

P. Homo-sp, GPC- 1.98-2.09 (between Pre-Olduvai event and age KNM-ER 1470

. Rt, proximal humerus Homo sp KBS-25m 1.98-2.09 (between Pre-Olduvai event and age KNM-ER 1470

. Rt, proximal femur Homo sp KBS-25m 1.98-2.09 (between Pre-Olduvai event and age KNM-ER 1470

. Rt, proximal tibia Homo sp KBS-27m 1.98-2.09 (between Pre-Olduvai event and age KNM-ER 1470

. Rt, Femur Homo sp KBS-30m 1.98-2.09 (between Pre-Olduvai event and age KNM-ER 1470

. Lt, mandibular body Homo sp. F- 1.98-2.09 (between Pre-Olduvai event and age KNM-ER 1470) 1474 Vault fragment Homo sp