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Cyprideis torosa (Jones, 1850) in its type area and stratigraphical context: potential for mapping the freshwater/estuarine boundaries of the Thames–Medway river system in the MIS 9 and MIS 11 interglacials

David J. Horne, Ginny Benardout and John E. Whittaker
Journal of Micropalaeontology, 36, 127-135, 15 August 2016, https://doi.org/10.1144/jmpaleo2015-037
David J. Horne
1School of Geography, Queen Mary University of London, Mile End Road, London E1 4NS, UK
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Ginny Benardout
1School of Geography, Queen Mary University of London, Mile End Road, London E1 4NS, UK
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John E. Whittaker
2Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
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Abstract

This study explores the potential of the ostracod Cyprideis torosa (Jones, 1850) as a brackish-water indicator for mapping freshwater/estuarine boundaries in Pleistocene interglacials in SE England. Ostracod species records from MIS 9 (Purfleet) and MIS 11 (Hoxnian) interglacial sites are mapped onto established palaeogeographies of the Thames–Medway river system, revealing distribution patterns indicative of a salinity gradient from west (freshwater) to east (brackish estuarine) in both cases. Comparisons with the ostracod biofacies of the present-day Thames Estuary suggest there may be no exact modern analogue for the Thames/Medway palaeoenvironments of the MIS 9 and MIS 11 interglacials. A similar conclusion is drawn from discussion of noding in C. torosa, which is common in the interglacial assemblages but extremely rare in the modern estuary. The value of mapping C. torosa onto estuarine palaeogeography is limited by taphonomic considerations because post-mortem transport and mixing in a macrotidal estuary significantly influence the composition of ostracod assemblages. Nevertheless, its use in combination with other brackish-water taxa provides useful insights regarding the palaeosalinity regimes of the lower River Thames and River Medway during the MIS 9 and MIS 11 interglacials.

  • Ostracoda
  • Pleistocene
  • salinity
  • palaeogeography
  • England
  • © 2017 The Author(s)
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Journal of Micropalaeontology: 36 (1)
Journal of Micropalaeontology
Volume 36, Issue 1
January 2017
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Cyprideis torosa (Jones, 1850) in its type area and stratigraphical context: potential for mapping the freshwater/estuarine boundaries of the Thames–Medway river system in the MIS 9 and MIS 11 interglacials

David J. Horne, Ginny Benardout and John E. Whittaker
Journal of Micropalaeontology, 36, 127-135, 15 August 2016, https://doi.org/10.1144/jmpaleo2015-037
David J. Horne
1School of Geography, Queen Mary University of London, Mile End Road, London E1 4NS, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: d.j.horne@qmul.ac.uk
Ginny Benardout
1School of Geography, Queen Mary University of London, Mile End Road, London E1 4NS, UK
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  • Find this author on PubMed
  • Search for this author on this site
John E. Whittaker
2Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
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Cyprideis torosa (Jones, 1850) in its type area and stratigraphical context: potential for mapping the freshwater/estuarine boundaries of the Thames–Medway river system in the MIS 9 and MIS 11 interglacials

David J. Horne, Ginny Benardout and John E. Whittaker
Journal of Micropalaeontology, 36, 127-135, 15 August 2016, https://doi.org/10.1144/jmpaleo2015-037
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