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High-precision radiocarbon dating of the construction phase of Oakbank Crannog, Loch Tay, Perthshire

By G. Cook, T.N. Dixon, N. Russell, P. Naysmith, S. Xu and B. Andrian

Abstract

Many of the Loch Tay crannogs were built in the Early Iron Age and so calibration of the radiocarbon ages produces\ud very broad calendar age ranges due to the well-documented Hallstatt plateau in the calibration curve. However, the\ud large oak timbers that were used in the construction of some of the crannogs potentially provide a means of improving the precision of the dating through subdividing them into decadal or subdecadal increments, dating them to high precision and wiggle-matching the resulting data to the master <sup>14</sup>C calibration curve. We obtained a sample from 1 oak timber from Oakbank Crannog comprising 70 rings (Sample OB06 WMS 1, T103) including sapwood that was complete to the bark edge. The timber is situated on the northeast edge of the main living area of the crannog and as a large and strong oak pile would have been a useful support in more than 1 phase of occupation and may be related to the earliest construction phase of the site. This was sectioned into 5-yr increments and dated to a precision of approximately ±8–16 <sup>14</sup>C yr (1 &#963;). The wiggle-match predicts that the last ring dated was formed around 500 BC (maximum range of 520–465 BC) and should be taken as indicative of the likely time of construction of Oakbank Crannog. This is a considerable improvement on the estimates based on single <sup>14</sup>C ages made on oak samples, which typically encompassed the period from around 800–400 BC

Topics: CC, GE
Publisher: University of Arizona
Year: 2010
OAI identifier: oai:eprints.gla.ac.uk:43477
Provided by: Enlighten

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Citations

  1. (2001). Development of the radiocarbon calibration program. Radiocarbon 43(2A):355–63.
  2. (1998). Evaluation of wood pretreatments on oak and cedar.
  3. (1996). Improved sealed-tube combustion of organic samples to CO2 for stable isotopic analysis, radiocarbon dating and percent carbon determinations. doi
  4. (2004). IntCal04 terrestrial radiocarbon age calibration, 0–26 cal kyr BP.
  5. (1985). Landscape with Lake Dwellings. doi
  6. (1981). Preliminary excavation of Oakbank Crannog, Loch Tay: interim report. doi
  7. (1987). Preparation of small samples for 14C accelerator targets by catalytic reduction of CO.
  8. (1995). Radiocarbon calibration and analysis of stratigraphy: the OxCal program. doi
  9. (2007). Radiocarbon dating of the crannogs of Loch Tay,
  10. (2004). The Crannogs of Scotland: an Underwater Archaeology. Port Stroud: Tempus Publishing Ltd.

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