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A new chronological framework for Middle and Upper Pleistocene landscape evolution in the Sussex/Hampshire Coastal Corridor, UK |
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| Authors: | Martin R Bates Rebecca M Briant Jean-Luc Schwenninger |
| Institution: | a Department of Archaeology and Anthropology, University of Wales Lampeter, Lampeter, Ceredigion, Wales SA48 7ED, United Kingdom b School of Geography, Birkbeck College, University of London, Malet Street, London WC1E 7HX, United Kingdom c Department of Earth and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095-1567, USA d Research Laboratory for Archaeology and History of Art, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, United Kingdom e Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom |
| Abstract: | The unique Middle and Late Pleistocene sedimentary record preserved along the Sussex/Hampshire Coastal Corridor between Romsey and Brighton contains a wealth of deposits including highstand marine sediments associated with a variety of different aged beaches, fluvial sediments associated with rivers crossing the coastal plain and cold stage deposits accumulating above the marine and fluvial sediments. Although quarrying activity has been extensive across much of the area it has been undertaken in flooded workings due to the high level of the watertable. Consequently little is known in detail about the sequences except where they outcrop on the foreshore around the coast. This paper examines recent work from the lower coastal plain using a multi-disciplinary approach these deposits to elucidate the age of the sequences and their associated environments of deposition.OSL dates from two of the beaches, the Aldingbourne and Brighton/Norton Beaches, place both within MIS 7. Although these OSL dates cannot differentiate between sub-stages within MIS 7, coupling these results with inferences from local geography, lithology and contained microfossils it is clear that the beaches belong to two different phases within MIS 7. These two beaches are clearly divided by a major phase of erosion and downcutting associated with a fall in sea-level. Fluvial sediments from Solent Terrace 2 and Arun Terrace 4 also date within MIS 7 and are tentatively ascribed to the downcutting event between the beaches. Together this information allows us to propose, for the first time, a robust independently dated framework for the lower parts of the coastal plain integrating for the first time the marine and terrestrial record. |
| Keywords: | Middle/Upper Pleistocene Raised Beaches Fluvial sequences Foraminifera Ostracoda Non-analogue faunas OSL dating Palaeogeography MIS 7 |
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