Incised palaeo-channels of the late Middle Pleistocene Thames: age,origins and implications for fluvial palaeogeography and sea-level reconstruction in the southern North Sea basin |
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| Authors: | Helen M Roe Richard C Preece |
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| Institution: | 1. School of Geography, Archaeology and Palaeoecology, Queen’s University Belfast, Belfast, BT7 1NN, UK;2. Department of Zoology, University of Cambridge, Cambridge, CB2 3EJ, UK;1. Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, United States;2. Department of Earth Science, University of California, Santa Barbara, CA 93106, United States;3. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States;1. Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlá?ská 2, CZ-61137, Brno, Czech Republic;2. Department of Zoology, Faculty of Science, Charles University, Vini?ná 7, CZ-128 44, Praha 2, Czech Republic;3. Center for Theoretical Study, Charles University and The Czech Academy of Sciences, Jilská 1, CZ-110 00, Praha 1, Czech Republic;4. Department of Botany, Faculty of Science, Charles University, Benátská 2, CZ-128 01 Praha 2, Czech Republic;1. Department of Archaeology, Durham University, Dawson Building, South Road, Durham DH1 3LE, UK;2. School of Geography, Queen Mary, University of London, Mile End Road, London E1 4NS, UK;1. Département histoire de la terre, Muséum national d’histoire naturelle, BP 38, 57, rue Cuvier, 75231 Paris cedex 05, France;2. Departamento de Prehistoria, Historia Antigua y Arqueología, Facultad de Geografía e Historia, Universidad de Salamanca, C. Cerrada de Serranos s/n, 37002 Salamanca, Spain;1. Borissiak Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya 123, Moscow, 117997, Russia;2. Institute of Archaeology and Ethnography, Siberian Branch, Russian Academy of Sciences, Akademika Lavrentieva 17, Novosibirsk, 630090, Russia;1. Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut;2. Department of Radiation Oncology, Assistance publique–Hôpitaux de Paris, University of Paris–Est Créteil and Henri Mondor Breast Center, Créteil Cedex, France |
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| Abstract: | Multidisciplinary investigations of the infills of steeply-incised buried channels on the coast of Essex, England, provide important insights into late Middle Pleistocene climate and sea-level change and have a direct bearing on the differentiation of MIS 11 and MIS 9 in terrestrial records. New data are presented from Rochford and Burnham-on-Crouch where remnants of two substantial palaeo-channels filled with interglacial sediment can be directly related to the terrace stratigraphy of the Thames. The sediments in both channels accumulated in an estuarine environment early in an interglacial when mixed oak forest was becoming established. Lithological evidence suggests that the interglacial beds post-date the brackish-water infill of an older palaeo-channel ascribed to the Hoxnian and correlated with part of MIS 11, and pre-date terrace gravels (Barling Gravel) ascribed to MIS 8. An MIS 9 attribution is supported by molluscan biostratigraphy, palaeo-salinity and amino-acid racemization data. The relative sea-level record in this area thus includes evidence for two major marine transgressions during MIS 11 and MIS 9, with local maxima of >10 m O.D. Both are associated with sediments that show ‘Hoxnian’ palynological affinities. The wider significance of these findings, and of an intermediate phase of pronounced fluvial incision during MIS 10, is discussed. |
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