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OSL ages were compared to a well defined radiocarbon chronology from RCC, and any inconsistencies would motivate closer sorting of the different dating techniques.In this study it was found that not all feldspar grains were removed from the quartz extracts during pretreatment procedures.A single-grain analysis demonstrates that the testing procedure for feldspar fails to reject single aliquots containing feldspar and the overestimate of age is attributed to this.Seven additional luminescence dates for the Middle Stone Age layers combined with the C chronology establish the terminal Middle Stone Age deposits at 27 000 years ago, while stone tool assemblages that are transitional between the Middle Stone Age and the Late Stone Age are dated to between 27 000 years and 20 000 years ago.

Recalculation of the luminescence dates using a model of dose rate build-up illustrates that the 'mobile' component is large enough to account for the discrepancy.Following the single-aliquot regenerative (SAR) method of Murray and Wintle (2000), the dose equivalent (De) is calculated by first measuring the natural luminescence of a sample.Position: Professor Emeritus Qualification: Phd Department: Archaeology Phone: 27 Email:[email protected] Room: Lyn Wadley is an honorary professor of archaeology, affiliated jointly with the Archaeology Department (School of Geography, Archaeology and Environmental Studies) and the Institute for Human Evolution. Lyn Wadley is the director of the research unit called ACACIA (Ancient Cognition and Culture in Africa), which is housed by the University of the Witwatersrand. E., Schiegl, S., Ligouis, B., Berna, F., Conard, N. Optically-Stimulated Luminescence is a late Quaternary dating technique used to date the last time quartz sediment was exposed to light.As sediment is transported by wind, water, or ice, it is exposed to sunlight and zeroed of any previous luminescence signal.

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