3.3-million-year-old stone tools from Lomekwi 3, West Turkana, Kenya (original) (raw)

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Acknowledgements

We thank the office of the President of Kenya, the Ministry of Education, Science and Technology, the National Council for Science and Technology (NCST/RCD/12B/012/25) and the National Museums of Kenya for permission to conduct research. Funding was provided by the French Ministry of Foreign Affairs (N°681/DGM/ATT/RECH, N°986/DGM/DPR/PRG), the French National Research Agency (ANR-12-CULT-0006), the Fondation Fyssen, the National Geographic Society (Expeditions Council #EC0569-12), the Rutgers University Research Council and Center for Human Evolutionary Studies, and INTM Indigo Group France. We thank the Turkana Basin Institute and Total Kenya Limited for logistical support and the GeoEye Foundation for satellite imagery; the Turkana communities from Nariokotome, Kokiselei and Katiko for field assistance, and the 2011-12 WTAP team, S. Kahinju, P. Egolan, L. P. Martin, D. Massika, B. K. Mulwa S. M. Musyoka, A. Mutisiya, J. Mwambua, F. M. Wambua, M. Terrade, A. Weiss, R. Benitez, S. Feibel. M. Leakey and F. Spoor supplied information on hominin fossils, and I. de la Torre and E. Hovers provided lithic assemblage data. We are very grateful to A. Brooks, I. de la Torre, J. Shea, R. Klein and M. Leakey for comments on earlier drafts. We also thank the Zoller & Fröhlich GmbH company, Ch. Fröhlich and M. Reinköster, Autodesk and Faro (T. O’Mahoney, K. Almeida Warren and T. Gichunge) for technical support with scanning and J. P. Chirey for photographic assistance.

Author information

Authors and Affiliations

  1. Turkana Basin Institute, Stony Brook University, Stony Brook, 11794-4364, New York, USA
    Sonia Harmand, Jason E. Lewis & Louise Leakey
  2. CNRS, UMR 7055, Préhistoire et Technologie, Université Paris Ouest Nanterre La Défense, 21 allée de l’Université, Nanterre Cedex, 92023, France
    Sonia Harmand, Adrian Arroyo, Nicholas Taylor & Hélène Roche
  3. West Turkana Archaeological Project, P.O. Box 40658-00100, Ngara Rd, Nairobi, Kenya
    Sonia Harmand, Jason E. Lewis, Craig S. Feibel, Christopher J. Lepre, Sandrine Prat, Arnaud Lenoble, Xavier Boës, Rhonda L. Quinn, Nicholas Taylor, Sophie Clément, Jean-Philip Brugal, Sammy Lokorodi, Christopher Kirwa & Hélène Roche
  4. Department of Anthropology and Center for Human Evolutionary Studies, Rutgers University, New Brunswick, 08901, New Jersey, USA
    Jason E. Lewis & Craig S. Feibel
  5. Department of Earth and Planetary Sciences, Rutgers University, Piscataway, 08854, New Jersey, USA
    Craig S. Feibel, Christopher J. Lepre, Rhonda L. Quinn, Richard A. Mortlock, James D. Wright & Dennis V. Kent
  6. Lamont-Doherty Earth Observatory of Columbia University, Palisades, 10964, New York, USA
    Christopher J. Lepre & Dennis V. Kent
  7. CNRS, UPR 2147, Dynamique de l’Evolution Humaine, 44 rue de l’Amiral Mouchez, Paris, 75014, France
    Sandrine Prat & Xavier Boës
  8. CNRS, UMR 5199 PACEA, Université de Bordeaux, Pessac, 33615, France
    Arnaud Lenoble & Michel Brenet
  9. Department of Sociology, Anthropology and Social Work, Seton Hall University, South Orange, 07079, New Jersey, USA
    Rhonda L. Quinn
  10. Inrap, Centre Mixte de Recherche Archéologique, Domaine de Campagne, Campagne, 24620, France
    Michel Brenet
  11. Inrap, 34-36 avenue Paul-Vaillant Couturier, La Courneuve, 93120, France
    Sophie Clément
  12. IPHEP, Institut de Paléoprimatologie, Paléontologie Humaine: Évolution et Paléoenvironnements, CNRS, UMR 7262, Université de Poitiers, Bât. B35 – TSA 51106, 6 rue Michel Brunet, Poitiers Cedex 9, 86073, France
    Guillaume Daver
  13. Aix-Marseille Université, CNRS, MCC, UMR 7269, LAMPEA, Aix-en-Provence Cedex 2, 13094, France
    Jean-Philip Brugal
  14. Department of Earth Sciences, National Museums of Kenya, Archaeology Section, P.O. Box 40658-00100 Ngara Rd, Nairobi, Kenya
    Christopher Kirwa

Authors

  1. Sonia Harmand
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  2. Jason E. Lewis
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  3. Craig S. Feibel
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  4. Christopher J. Lepre
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  5. Sandrine Prat
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  6. Arnaud Lenoble
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  7. Xavier Boës
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  8. Rhonda L. Quinn
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  9. Michel Brenet
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  10. Adrian Arroyo
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  11. Nicholas Taylor
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  12. Sophie Clément
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  13. Guillaume Daver
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  14. Jean-Philip Brugal
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  15. Louise Leakey
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  16. Richard A. Mortlock
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  17. James D. Wright
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  18. Sammy Lokorodi
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  19. Christopher Kirwa
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  20. Dennis V. Kent
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  21. Hélène Roche
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Contributions

S.H. and J.E.L. directed field research and co-wrote the overall paper. C.S.F., C.J.L., A.L. and X.B. recorded sedimentological and stratigraphic data, conducted geological mapping, and wrote sections of the paper. C.S.F. interpreted tephra data. C.J.L. interpreted paleomagnetic data. S.P., J.-Ph.B., S.L., C.K. and L.L. conducted paleontological survey. S.P., J.-Ph.B. and L.L. analysed and interpreted fossil material. L.L. directed scanning of artefacts. S.P. laser scanned artefacts and excavation surfaces, and wrote sections of the paper. R.L.Q. interpreted isotopic data and wrote sections of the paper. C.S.F., C.J.L., R.L.Q., R.A.M., J.D.W. and D.V.K. analysed geological samples. G.D. developed protocols for tool replication experiments and wrote sections of the paper. S.H., H.R., N.T., M.B., S.C., S.L. and C.K. conducted archaeological survey and excavation. S.H., H.R., A.A., N.T. and M.B. analysed and interpreted lithic material and wrote sections of the paper. M.B. performed lithic replication experiments. S.C. provided spatial data. S.L. discovered the LOM3 site.

Corresponding authors

Correspondence toSonia Harmand or Jason E. Lewis.

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Competing interests

The authors declare no competing financial interests.

Extended data figures and tables

Extended Data Figure 1 Map and schematic section at LOM3.

a, Map showing xy coordinates of artefacts and fossils recovered in situ and from the surface at the site in 2011 and 2012. b, Schematic section showing vertical distribution of in situ artefacts and those located in the slope deposit at the excavation. Key is the same for both figures.

Extended Data Figure 2 Geology of the LOM3 site.

a, Stratigraphic sections around LOM3 (locations in b), showing relationship of site to marker tuffs and lithofacies. Sections aligned relative to top of flat-pebble conglomerate unit. b, GPS coordinates of stratigraphic sections (WGS84 datum).

Extended Data Figure 3 Paleomagnetic data.

a, Representative vector end-point plots of natural remanent magnetism thermal demagnetization data from specimen Toroto Tuff, tt2, wt59, wt50, wt45, wt36. Open and closed symbols represent the vertical and horizontal projections, respectively, in bedding coordinates. TD treatment steps: NRM, 100°, 150°, 200°, 250°, 300°, 350°, 400°, 450°, 475°, 500°, 525°, 550°, 575°, 600°, 625°, 650°, 660°, 670°, 675°, 680°, 690°, and 700°. V/M = 10 denotes a ∼10 cc cubic specimen. b, Equal-area projections for Section 1 (left) and Section 2 (right) of the lower Lomekwi Member (see Fig. 3a). Open and closed symbols are projected onto the upper and lower hemisphere, respectively, in bedding coordinates. Plotted are ChRM sample-mean directions for accepted samples only (that is, those with MAD values <15°). Overall mean directions were calculated after inverting the northerly (normal) directions to common southerly (reverse) polarity.

Extended Data Figure 4 Paleoenvironmental reconstruction through pedogenic carbonate stable carbon isotopic analysis.

a, LOM3 paleosol δ13CVPDB values (‰) ± 1σ, number of analyses, fraction woody canopy cover (ƒwc) and percent C4 biomass contribution to soil CO2. Asterisk denotes nodules sampled at the LOM3 site, 2011-2b (see Extended Data Fig. 2a). b, Schematic box and whisker plots of ƒwc from the LOM3 (3.3 Ma, this study) and Gona33,54,[55](/articles/nature14464#ref-CR55 "Levin, N. E. Compilation of East Africa soil carbonate stable isotope data. Integrated Earth Data Applications http://dx.doi.org/10.1594/IEDA/100231

             (2013).") (Busidima Fm, 2.5–2.7 Ma) lithic sites and other East African hominin localities from 3.2–3.4 Ma[34](/articles/nature14464#ref-CR34 "Crabtree, D. E. An introduction to flintworking. Part 1. An introduction to the technology of stone tools. Occasional Papers of the Idaho State University Museum 28, (Idaho State Univ. Museum, 1972)."),[55](/articles/nature14464#ref-CR55 "Levin, N. E. Compilation of East Africa soil carbonate stable isotope data. Integrated Earth Data Applications
              http://dx.doi.org/10.1594/IEDA/100231
              
             (2013)."),[56](/articles/nature14464#ref-CR56 "Cerling, T. E., Bowman, J. R. & O’Neil, J. R. An isotopic study of a fluvial-lacustrine sequence: the Plio-Pleistocene Koobi Fora sequence, East Africa. Palaeogeogr. Palaeoclimatol. Palaeoecol. 63, 335–356 (1988)."),[57](/articles/nature14464#ref-CR57 "Levin, N. E., Brown, F. H., Behrensmeyer, A. K., Bobe, R. & Cerling, T. E. Paleosol carbonates from the Omo Group: isotopic records of local and regional environmental change in East Africa. Palaeogeogr. Palaeoclimatol. Palaeoecol. 307 75–89 (2011) 
              CrossRef
              
            ."),[58](/articles/nature14464#ref-CR58 "Wynn, J. G. Influence of Plio-Pleistocene aridification on human evolution: evidence from paleosols from the Turkana Basin, Kenya. Am. J. Phys. Anthropol. 123, 106–118 (2004)."),[59](/articles/nature14464#ref-CR59 "Kingston, J. D. Stable isotopic evidence for hominid paleoenvironments in East Africa. Ph.D. Thesis, Harvard Univ. (1992)."),[60](/articles/nature14464#ref-CR60 "Aronson, J. L., Hailemichael, M. & Savin, S. M. Hominid environments at Hadar from paleosol studies in a framework of Ethiopian climate change. J. Hum. Evol. 55, 532–550 (2008)."),[61](/articles/nature14464#ref-CR61 "Wynn, J. G. et al. Geological and palaeontological context of a Pliocene juvenile hominin at Dikika, Ethiopia. Nature 443, 332–336 (2006).") relative to UNESCO structural categories of African vegetation[32](/articles/nature14464#ref-CR32 "Cerling, T. E. et al. Woody cover and hominin environments in the past 6 million years. Nature 476, 51–56 (2011)."),[52](/articles/nature14464#ref-CR52 "White, F. The vegetation of Africa, a descriptive memoir to accompany the UNESCO/AETFAT/UNSO vegetation map of Africa. UNESCO. Nat. Resour. Res. 20, 1–356 (1983)."). Grey box denotes 25th and 75th percentiles (interquartile range); whiskers represent observations within upper and lower fences (1.5 × interquartile range); black line shows mean value; grey line equals median value; black circles indicate mild outliers. **c**, Summary statistics of paleosol δ13CVPDB values and ƒwc from LOM3 (3.3 Ma) and Gona[33](/articles/nature14464#ref-CR33 "Quade, J. et al. Paleoenvironments of the earliest stone toolmakers, Gona, Ethiopia. Geol. Soc. Am. Bull. 116, 1529–1544 (2004)."),[54](/articles/nature14464#ref-CR54 "Levin, N. E., Quade, J., Simpson, S. W., Semaw, S. & Rogers, M. J. Isotopic evidence for Plio-Pleistocene environmental change at Gona, Ethiopia. Earth Planet. Sci. Lett. 219, 93–110 (2004)."),[55](/articles/nature14464#ref-CR55 "Levin, N. E. Compilation of East Africa soil carbonate stable isotope data. Integrated Earth Data Applications
              http://dx.doi.org/10.1594/IEDA/100231
              
             (2013).") (2.5–2.7 Ma) lithic sites and other East African hominin localities from 3.2–3.4 Ma[54](/articles/nature14464#ref-CR54 "Levin, N. E., Quade, J., Simpson, S. W., Semaw, S. & Rogers, M. J. Isotopic evidence for Plio-Pleistocene environmental change at Gona, Ethiopia. Earth Planet. Sci. Lett. 219, 93–110 (2004)."),[55](/articles/nature14464#ref-CR55 "Levin, N. E. Compilation of East Africa soil carbonate stable isotope data. Integrated Earth Data Applications
              http://dx.doi.org/10.1594/IEDA/100231
              
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Extended Data Figure 5 Gradual uncovering of core I16-3 from in situ pliocene sediment.

a, Photograph showing square I16 at the beginning of excavation. Yellow line indicates north wall of square (July 16, 2011, 12.14 p.m.). b, Close-up of square I16 indicating complete burial of as-yet-uncovered artefact I16-3 (12.14 p.m.). c, Square I16 after excavation had begun and artefact I16-3 was initially exposed (2:11 p.m.). d, Close-up of artefact I16-3 after being initially exposed (2.12 p.m.). e, Close-up of artefact I16-3 after further excavation (3.02 p.m.). f, Square I16 after further excavation (5.32 p.m.). g, Close-up of artefact I16-3 after further excavation (5.34 p.m.). h, Close-up of artefact I16-3 after being completely freed from the surrounding matrix and flipped over for inspection (5.36 p.m.). i, Close-up of impression from under artefact I16-3 (5.47 p.m.).

Extended Data Figure 6 Photos of selected LOM3 artefacts compared with similar experimental cores.

Together with the technological analysis of the archaeological material, our replication experiments suggest that the LOM3 knappers were using passive hammer technique, in which the core, usually held in both hands, is struck against a stationary object that serves as the percussor34 (also referred to as on-anvil, block on block or sur percuteur dormant35) and/or bipolar technique, in which the core is placed on an anvil and struck with a hammerstone34. a, Unifacial passive hammer cores. Left is archaeological piece LOM3-2012 surf 106 (2.04 kg); right is experimental piece Expe 55 (3.40 kg) produced using the passive hammer technique. Selection of relatively flat blocks with natural obtuse angles. The flake removal process starts from a slighly prominent part of the block (white arrows show the direction of removals). The removals tend to be invasive. The flaked surface forms a semi-abrupt angle with the platform surface. A slight rotation of the block ensures its semi-peripheral exploitation. b, Unifacial bipolar cores. Left are archaeological pieces LOM3-2012-H18-1 (left, 3.45 kg) and LOM3-2012 surf 64 (right, 2.58 kg); right are experimental pieces Expe 39 (left, 4.20 kg) and Expe 24 (right, 2.23 kg) produced using the bipolar technique. The block selected are thicker and more quadrangular in shape with natural angles ≈90°. Flakes are removed from a single secant platform (white arrows show the direction of removals). The flaked surface forms an abrupt angle with the other faces of the block. Impacts due to the contrecoups (white dots) are visible on the opposite edge from the platform.

Extended Data Figure 7 Photographs of selected LOM3 artefacts.

a, Passive element/anvil (LOM3-2012 surf 50,15 kg). Heavy sub-rectangular block displaying flat faces and therefore a natural morphology and weight which would enable stability. b, Hammerstone showing isolated impact points (LOM3-2012 surf 33, 3.09 kg) and c, Hammerstone showing isolated impact points (LOM3-2012 surf 54, 1.63 kg), associated with a flake-like fracture on one end.

Extended Data Table 1 Numerical data on the LOM3 lithic assemblage (2011, 2012).

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Extended Data Table 2 Comparison of whole flake and core dimensions between LOM3, early Oldowan sites and chimpanzee stone tool sites

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Extended Data Table 3 Comparison of anvils and percussors dimensions found at LOM3 site with anvils and percussors used by non-human primates in Bossou (wild chimpanzees, Pan troglodytes verus from ref. 41)

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Harmand, S., Lewis, J., Feibel, C. et al. 3.3-million-year-old stone tools from Lomekwi 3, West Turkana, Kenya.Nature 521, 310–315 (2015). https://doi.org/10.1038/nature14464

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