RADIOCARBON DATING WOODEN CARVINGS and SKELETAL REMAINS from PITCH LAKE, TRINIDAD Fiona Brock1* Joanna Ostapkowicz2,3 Alex C Wiedenhoeft4 Ian D Bull5
Radiocarbon, Vol 59, Nr 5, 2017, p 1447–1461 DOI:10.1017/RDC.2017.78 Selected Papers from the 8th Radiocarbon & Archaeology Symposium, Edinburgh, UK, 27 June–1 July 2016 © 2017 by the Arizona Board of Regents on behalf of the University of Arizona RADIOCARBON DATING WOODEN CARVINGS AND SKELETAL REMAINS FROM PITCH LAKE, TRINIDAD 1* 2,3 4 5 Fiona Brock Joanna Ostapkowicz Alex C Wiedenhoeft Ian D Bull 1Cranfield Forensic Institute, Cranfield University, Defence Academy of the United Kingdom, Shrivenham, Oxon, SN6 8LA, United Kingdom. 2World Museum, National Museums Liverpool, William Brown Street, Liverpool, L3 8EN, United Kingdom. 3School of Archaeology, University of Oxford, 36 Beaumont Street, Oxford, OX1 2PG, United Kingdom. 4Center for Wood Anatomy Research, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI, 53726 USA. 5Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, United Kingdom. ABSTRACT. Since the mid-19th century, rare prehistoric wooden carvings and human skeletal remains have been dredged from Pitch Lake, Trinidad, during commercial asphalt mining. Establishing a chronology for these objects is challenging, due to both a lack of stratigraphic and contextual information and the necessity to completely remove any pitch to ensure accurate radiocarbon (14C) dates. A range of solvent extraction protocols was tested to identify the most suitable one for pretreating the Pitch Lake artifacts, and then applied to ten wooden objects and a human cranium recovered from the lake. Several of these objects yielded earlier dates than expected, raising concerns that pitch had remained after pretreatment and had affected the dates.
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