Stratigraphic analysis of the Sterkfontein StW 573 Australopithecus skeleton and implications for its age

Journal of Human Evolution
Laurent BruxellesDominic Stratford

Abstract

StW 573, Little Foot, is the most complete Australopithecus skeleton yet discovered, with many of its bones found in their correct anatomical position. Since the discovery of the in situ skeleton in the Silberberg Grotto in 1997, several teams have attempted to date the fossil. This appeared a simple process because several flowstones are inter-bedded in the breccia above and below StW 573. Dating of these flowstones, using U-Pb (uranium-lead) isotope decay techniques, gave younger results than expected from the fauna and stratigraphic position, around 2.2 Ma (millions of years). Our recent stratigraphic, micromorphological and geochemical studies revealed that the stratigraphy is much more complicated than was previously thought, with localized post-depositional processes leading to the creation of voids within the breccia around the skeleton. These voids were then filled by multiple generations of flowstone growth. The research we present here demonstrates that the proposed dates based on the flowstone deposition can give only a minimum age for StW 573 and that the flowstone formation came after, and probably long after, the breccia deposition. If one takes account of the long evolution of these karst fillings, StW 573 appear...Continue Reading

References

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Citations

Feb 28, 2015·International Journal of Environmental Research and Public Health·Miho IgarashiYoshifumi Miyazaki
Sep 12, 2009·Journal of Human Evolution·R Adriana Hernandez-Aguilar
Dec 16, 2018·American Journal of Physical Anthropology·L R Berger, John Hawks
Mar 4, 2017·Journal of Molecular Neuroscience : MN·Nguyen Thi Thanh HoKlaus Heese
Dec 26, 2018·Journal of Human Evolution·Amélie BeaudetDominic Stratford
Apr 3, 2018·Journal of Human Evolution·Travis R PickeringDominic Stratford
Apr 24, 2021·Journal of Human Evolution·Kristian J CarlsonRonald J Clarke

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