Luminescence Dating in Less Than Ideal Conditions: Case Studies from Klasies River Main Site and Duinefontein,South Africa |
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| Institution: | 1. Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook University, Stony Brook, NY, USA;2. Department of Anthropology and Development Studies, University of Johannesburg, Auckland Park 2006, South Africa;3. School of Archaeology, Research Laboratory for Archaeology and the History of Art, University of Oxford, Oxford, United Kingdom;4. School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South Africa;5. School of Archaeology, University of Oxford, Oxford, United Kingdom |
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| Abstract: | Luminescence dating results are reported for two South African archaeological sites where changes in the dose rate through time are apparent. A subtraction procedure involving analysis of both quartz and potassium-feldspar extracts is applied to detect and correct for these changes. At the Middle Stone Age site of Klasies River, the dose rate changes inferred from geologic evidence for shell dissolution turn out not to be significant, having occurred rapidly after deposition. The dates here range from 50–115 ka, in broad agreement with other evidence. The important Howiesons Poort component here appears to date somewhat later (about 55–60 ka) than at several other sites in South Africa. At the Acheulian site of Duinefontein, the dose rate changes, also thought to be caused by shell dissolution, are, on the other hand, very significant. The subtraction ages here (125–300 ka) agree with independent chronological assessments. |
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