Stratigraphic analysis of the Sterkfontein StW 573 Australopithecus skeleton and implications for its age
- Permanent Link:
- Stratigraphic analysis of the Sterkfontein StW 573 Australopithecus skeleton and implications for its age
- Series Title:
- Journal of Human Evolution
- Bruxelles, Laurent
Clarke, Ronald J.
- Publication Date:
- Subjects / Keywords:
- Little Foot ( local )
Geochronology ( local )
Pliocene ( local )
Micromorphology ( local )
Geochemistry ( local )
Silberberg Grotto ( local )
South Africa ( local )
- serial ( sobekcm )
- 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 Uâ€“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 appears to be significantly older than 2.2 Ma.
- Original Version:
- Journal of Human Evolution, Vol. 70 (2014-05).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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