Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations,Shetland Isles |
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| Institution: | 1. Oxford Luminescence Research Group, Luminescence Dating Laboratory, Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford, OX1 3QJ, UK;2. Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford, OX1 3QJ, UK;3. Department of Archaeological Sciences, University of Bradford, Bradford, W. Yorkshire, BD7 1DP, UK;1. Soil Geography and Landscape Group, Netherlands Centre for Luminescence Dating, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands;2. Group for Rural Hydrology and Hydraulics, Department of Agronomy, University of Cordoba, Spain;1. University of Lausanne, Institute of Earth Surface Dynamics, Géopolis, Lausanne, Switzerland;2. Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, ul. Grudziądzka 5, 87-100, Toruń, Poland;3. Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca, Milan, Italy;4. Geography & Earth Sciences, Aberystwyth University, Aberystwyth, Wales, United Kingdom;5. Archéosciences Bordeaux, UMR 6034, CNRS - Université Bordeaux Montaigne, Pessac, France;6. Institute of Geography, Heidelberg University, Heidelberg, Germany;7. Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research “Demokritos”, Athens, Greece;8. Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, United Kingdom;9. Institute of Physics - Centre for Science and Education, Division of Geochronology and Environmental Isotopes, Silesian University of Technology, Konarskiego, 22B, 44-100, Gliwice, Poland;1. National Research Centre on Human Evolution (CENIEH), Paseo Sierra de Atapuerca 3, 09002, Burgos, Spain;2. Institute of Geography, University of Cologne, Otto-Fischer-Straße 4, 50674, Cologne, Germany;3. Institute of Earth Surface Dynamics, University of Lausanne, 1015, Lausanne, Switzerland;4. Dept. Physical Chemistry, Faculty of Science, University of Malaga, E-29071, Malaga, Spain |
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| Abstract: | In this paper, we illustrate the ways in which Bayesian statistical techniques may be used to enhance chronological resolution when applied to a series of OSL sediment dates. Such application can achieve an optimal chronological model by incorporating stratigraphic and age information. The application to luminescence data is not straightforward owing to the sources of uncertainty in each date, and here we present one solution to overcoming these difficulties, and introduce the concept of “unshared systematic” errors. Using OSL sediment dates from the site of Old Scatness Broch, Shetland Isles, UK, many measured with a high degree of precision, we illustrate some of the ways in which Bayesian techniques may be applied, as a tool for assessing systematic errors when combined with independent chronological information, and to determine the optimum chronological information for specific events and contexts. We provide a detailed procedure for the application of Bayesian methods to OSL dates using the widely available radiocarbon calibration programme OxCal. |
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