Bridgland, D.R. and Harding, P. and Allen, P. and Candy, I. and Cherry, C. and George, W. and Horne, D.J. and Keen, D.H. and Penkman, K.E.H. and Preece, R.C. and Rhodes, E.J. and Scaife, R. and Schreve, D.C. and Schwenninger, J. and Slipper, I. and Ward, G.R. and White, M.J. and White, T.S. and Whittaker, J.E. (2013) 'An enhanced record of MIS 9 environments, geochronology and geoarchaeology : data from construction of the High Speed 1 (London–Channel Tunnel) rail-link and other recent investigations at Purfleet, Essex, UK.', Proceedings of the Geologists' Association., 124 (3). pp. 417-476.
New data from the complex Lower Thames locality at Purfleet, Essex, reinforce the correlation of interglacial deposits there with Marine Isotope Stage (MIS) 9, the second of four post-Anglian (MIS 12) interglacials recorded in the river-terrace sequence east of London. Arising from various developer-funded archaeologically driven projects, and primarily the construction of ‘High Speed 1’ (HS1: formerly the Channel Tunnel Rail Link), the new evidence includes additions to palaeontological knowledge of this interglacial, notably from ostracods and vertebrates, results from isotopic analyses of shell and concretionary carbonates, and the first application of numerical dating techniques at Purfleet. These analyses, combined with palaeotemperature estimates from the Mutual Ostracod Temperate Range method, confirm that deposition of the fossiliferous deposits coincided with interglacial conditions, with similar-to- or warmer-than-present summer temperatures and colder winters, providing a suggestion of greater continentality. OSL and amino-acid racemisation support correlation of the interglacial with MIS 9, whereas the climatic and sedimentological evidence points to correlation with the earliest and warmest substage (MIS 9e). There is also evidence that a greater part of the Purfleet sequence might date from the interglacial, although whether these also represent MIS 9e or later parts of the complex stage cannot be determined. The additional archaeological material is consistent with previous interpretations of a tripartite stratigraphical sequence of lithic traditions: basal Clactonian, above which is Acheulian (handaxe manufacture), followed by one of the earliest British appearances of Levallois technique. However, given the revised interpretation of the climatic affinity of the upper parts of the sequence, Levallois technique might have been used at Purfleet before the end of MIS 9.
|Keywords:||Thames terrace deposits, Palaeolithic, MIS 9 interglacial highstand, Geochronology, Biostratigraphy.|
|Full text:||(AM) Accepted Manuscript|
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|Publisher Web site:||http://dx.doi.org/10.1016/j.pgeola.2012.03.006|
|Publisher statement:||NOTICE: this is the author’s version of a work that was accepted for publication in Proceedings of the Geologists' Association. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Proceedings of the Geologists' Association, 124, 3, 2013, 10.1016/j.pgeola.2012.03.006.|
|Date accepted:||No date available|
|Date deposited:||16 July 2013|
|Date of first online publication:||March 2013|
|Date first made open access:||No date available|
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