Re-evaluation of the Last Glacial Maximum typesite at Dimlington, UK

Authors


  • Mark D. Bateman (e-mail: m.d.bateman@Sheffield.ac.uk), Martin A. Whyte, Robert A. Ashurst and Claire Boulter, Department of Geography, University of Sheffield, Winter Street, Sheffield S10 2TN, UK; Paul C. Buckland, Den Bank Close, Crosspool, Sheffield S10 5PA, UK; Eva Panagiotakopulu, School of Geosciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK

Abstract

Bateman, M. D., Buckland, P. C., Whyte, M. A., Ashurst, R. A., Boulter, C. & Panagiotakopulu, E. 2011: Re-evaluation of the Last Glacial Maximum typesite at Dimlington, UK. Boreas, 10.1111/j.1502-3885.2011.00204.x. ISSN 0300-9483.

Recent erosion has allowed re-examination of the stratigraphy and sampling for both optically stimulated luminescence dating and palaeoecological analysis of the key sections in the Last Glacial Maximum deposits at Dimlington in East Yorkshire, England. Both stratigraphy and fossil insect evidence support a subaerial origin for laminated and cross-bedded sediments between two diamictons previously interpreted as synchronous. The fossil biota indicates conditions similar to those of a pond on sandur in the high Arctic, with little or no vegetation cover. The existence of distinct oscillations of the ice front is indicated. The first, within the period 21.7–16.2 ka, appears coincident with climate warming, as deduced from Greenland ice-core evidence, and is interpreted as an ice stream associated with changing flow patterns within the British–Irish Ice Sheet (BIIS). The second, dating between 16.2 and 15.5 ka, appears to coincide with a climatic cooling, although current models show that the BIIS had by this period already retreated back to ice centres. This new evidence supports the view that the eastern sector of the BIIS did not reach its maximal extent synchronously with other parts of the BIIS.

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