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Best practice methodology for 14C calibration of marine and mixed terrestrial/marine samples
Institution:1. AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, A. Mickiewicza 30 Ave., 30-059 Krakow, Poland;2. Cracow University of Technology, Faculty of Environmental Engineering, Institute of Geotechnics, Warszawska 24 St., 31–155 Krakow, Poland;1. Department of Earth Sciences, Stellenbosch University, Stellenbosch, South Africa;2. Department of Thematic Studies — Environmental Change, Linköping University, 58183 Linköping, Sweden
Abstract:There is a lack of detailed guidance in the published literature on how to calibrate 14C measurements made on marine or mixed marine/terrestrial (primarily human remains) samples. We describe what we consider to be the best approach towards achieving the most accurate calibrated age ranges, using the most appropriate ΔR and percentage marine diet estimates, and associated, realistic error terms on these values. However, this approach will increase the calibrated age range(s) by fully accounting for the variability in both the model and the material. While the discussion is based on examples from the UK and Iceland, the same fundamental arguments can be applied in any geographic location largely devoid of C4 plants as the high δ13C values from such plants can make identification of marine intake difficult to determine.
Keywords:Radiocarbon  Calibration  Marine
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