The antiquity of Olivella shell beads at CA-ORA-64: AMS radiocarbon dated between 9420 and 7780 cal BP |
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| Institution: | 1. Fachbereich Geowissenschaften, Forschungsbereich Paläobiologie, AG Biogeologie, Universität Tübingen, Hölderlinstr. 12, 72074 Tübingen, Germany;2. Graduate School of Symbiotic Systems Science and Technology, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan;3. ICREA/Department of Experimental & Health Sciences, Universitat Pompeu Fabra, CaSEs Research Group, Ramon Trias Fargas 25–27, 08005 Barcelona, Spain;4. Department of Anthropology & Archaeology, University of South Africa (UNISA), PO Box 392, Pretoria, South Africa;1. Department of Geography & Environment, School of Geosciences, University of Aberdeen, Elphinstone Road, Aberdeen AB24 3UF, UK;2. Cambridge Archaeological Unit, Department of Archaeology, University of Cambridge, 34A Storeys Way, Cambridge, CB3 ODT, UK;3. Early Mines Research Group, Ashtree Cottage, 19, The High Street, Fen Ditton, Cambridgeshire CB5 8ST, UK;4. Departamento de Edafología y Química Agrícola, Facultad de Biología, Universidad de Santiago, Campus Sur, 15782 Santiago de Compostela, Spain;5. School of Science and Technology, University of Northampton, Newton Building, Northampton NN2 6JD, UK;6. Department of Geography, Rhodes University, Grahamstown, 6140, Eastern Cape, South Africa |
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| Abstract: | Investigations in the 1960s and 1970s showed the Irvine site (CA-ORA-64) to be among the oldest shell middens known from the Pacific Coast of North America. The site chronology, based on conventional analysis of mixed shell samples collected from heavily bioturbated soils, extended back to ca. 8440 RYBP. Recent work at the site provided an opportunity to refine the CA-ORA-64 chronology via AMS 14C dating of single shell fragments, including 14 Olivella beads. Long considered to be one of the earliest ornament types made by Pacific Coast peoples, such spire-removed Olivella beads were used through much of the Holocene and generally are not good chronological indicators. AMS analysis of the CA-ORA-64 specimens, however, produced a consistent series of Early Holocene dates that includes some of the oldest securely dated shell beads in North America. Along with obsidian from interior sources, Olivella beads played an important role in early exchange networks between coastal and interior peoples. Methodologically, our research demonstrates the utility of AMS 14C dating in determining the age of key artifact types found in multicomponent sites with assemblages affected by stratigraphic mixing. |
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