Bayesian estimates of marine radiocarbon reservoir effect in northern Iberia during the Early and Middle Holocene |
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| Institution: | 1. Departamento de Ciencias Humanas, Universidad de La Rioja, Edificio Vives, C/ Luis de Ulloa, 2, 26004, Logroño, Spain;2. Department of Archaeology, Max Planck Institute for the Science of Human History, Kahlaische Str. 10, 07745, Jena, Germany;3. Departamento de Geografía, Prehistoria y Arqueología, Universidad del País Vasco (UPV/EHU), C/ Tomás y Valiente s/n, 01006, Vitoria-Gasteiz, Spain;4. Instituto Internacional de Investigaciones Prehistóricas de Cantabria (Universidad de Cantabria, Gobierno de Cantabria, Grupo Santander), Universidad de Cantabria, Edificio Interfacultativo, Avda. Los Castros s/n, 39005, Santander, Spain;5. Centre de Recherche en Archéologie, Archeosciences, Histoire (CReAAH), UMR-6566, Université de Rennes 1, Rennes, France;6. Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Kiel University, Max- Eyth-Str. 11–13, 24118, Kiel, Germany;7. School of Social Sciences, University of Queensland, St Lucia, Queensland, 4072, Australia;8. School of Archaeology, University of Oxford, 1 South Parks Road, Oxford, OX1 3TG, United Kingdom;9. Faculty of Arts, Masaryk University, Arne Nováka 1, 602 00, Brno-st?ed, Czech Republic |
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| Abstract: | Reconstructing the past variability of marine radiocarbon reservoir effects (MRE) is crucial for generating reliable chronologies for marine species and their consumers. We investigated the temporal MRE variability at the Early-to Mid-Holocene site of El Mazo (Asturias, northern Spain) by using a combination of new and previously published radiocarbon measurements on marine and terrestrial samples. The El Mazo site is characterized by overall well-defined archaeological layers of unknown occupation length with the predominant presence of two mollusc species (Patella vulgata Linnaeus, 1758 and topshell Phorcus lineatus da Costa, 1778]) which were analysed for radiocarbon measurements. We employed the recently released IntCal20 calibration curve for the northern hemisphere and Bayesian modelling to reconstruct the site's chronology and temporal variability in MREs according to mollusc species. Obtained radiocarbon modelling results, although the estimate precision is not high, reveal a temporal variability in MREs that can be interpreted in view of known past climatic and environmental events such as the 8.2 ka event. The results also revealed differences in MREs according to mollusc species, which need to be taken into account in future chronological modelling. Overall, our results provide reference MRE values for the study of chronologies in northern Iberia during the Early-to Mid-Holocene. In this respect, a non-conservative ΔR reference for local marine samples dating earlier than c. 8.1 ka cal BP is ?238 ± 28 14C years. |
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| Keywords: | Mesolithic Shell middens Cantabrian region Marine radiocarbon reservoir effect Bayesian modelling Marine environments 8 2 ka event |
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