Letter

New cosmogenic burial ages for Sterkfontein Member 2 Australopithecus and Member 5 Oldowan

Received:
Accepted:
Published online:

Abstract

The cave infills at Sterkfontein contain one of the richest assemblages of Australopithecus fossils in the world, including the nearly complete skeleton StW 573 (‘Little Foot’)1,2,3,4 in its lower section, as well as early stone tools5,6,7 in higher sections. However, the chronology of the site remains controversial8,9,10,11,12,13,14 owing to the complex history of cave infilling. Much of the existing chronology based on uranium–lead dating10,11 and palaeomagnetic stratigraphy8,12 has recently been called into question by the recognition that dated flowstones fill cavities formed within previously cemented breccias and therefore do not form a stratigraphic sequence4,14. Earlier dating with cosmogenic nuclides9 suffered a high degree of uncertainty and has been questioned on grounds of sediment reworking10,11,13. Here we use isochron burial dating with cosmogenic aluminium-26 and beryllium-10 to show that the breccia containing StW 573 did not undergo significant reworking, and that it was deposited 3.67 ± 0.16 million years ago, far earlier than the 2.2 million year flowstones found within it10,11. The skeleton is thus coeval with early Australopithecus afarensis in eastern Africa15,16. We also date the earliest stone tools at Sterkfontein to 2.18 ± 0.21 million years ago, placing them in the Oldowan at a time similar to that found elsewhere in South Africa at Swartkans17 and Wonderwerk18.

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Acknowledgements

This work results from a collaboration begun with T. C. Partridge (deceased). AMS development and measurements were funded by National Science Foundation EAR1153689 to M.W.C. and D.E.G. and National Science Foundation EAR0844151 to D.E.G. Major funding to R.J.G., K.K. and R.J.C. was received from the Palaeontological Scientific Trust (PAST), which has supported research at Sterkfontein for 20 years. R.J.G. received bursary support from the National Research Foundation (NRF) of South Africa. K.K. thanks the NRF (SA) for substantial funding (AOP 1207112551-82611 and AOP1207173196-82591) and Prof. Bruce Rubidge of the Evolutionary Studies Institute for additional support. Figure 1 includes modified material from J. Hum Evol. vol. 70, Bruxelles L. et al., Stratigraphic analysis of the Sterkfontein StW 573 Australopithecus skeleton and implications for its age, 36–48 (2014), with permission from Elsevier.

Author information

Affiliations

  1. Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana 47907, USA

    • Darryl E. Granger
    •  & Marc W. Caffee
  2. Department of Anthropology, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada

    • Ryan J. Gibbon
  3. Evolutionary Studies Institute, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa

    • Kathleen Kuman
    •  & Ronald J. Clarke
  4. School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa

    • Kathleen Kuman
    •  & Laurent Bruxelles
  5. French National Institute for Preventive Archaeological Research (Inrap), 561 rue Etienne Lenoir, km delta, 30900 Nîmes, France

    • Laurent Bruxelles
  6. University of Toulouse Jean Jaurès, UMR 5608 du CNRS (TRACES), Maison de la Recherche, 5 Allées Antonio Matchado, F-31058 Toulouse, France

    • Laurent Bruxelles
  7. Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA

    • Marc W. Caffee

Authors

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Contributions

D.E.G. and R.J.G. conceived the project and performed laboratory work and data analysis. K.K. and R.J.C. supervised sample collection and interpretation of the dates. L.B. was responsible for mapping and interpretation of Member 2. M.W.C. supervised AMS measurements and methods development. All authors contributed to writing the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Darryl E. Granger.

Extended data

Extended data figures

  1. 1.

    Hand-picked samples.

  2. 2.

    Manuport.

Extended data tables

  1. 1.

    Burial ages for Oldowan manuport

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