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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
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 (in Thematic set; Cyprideis torosa, Anonymous)
Journal of Micropalaeontology (2016) 36 (1): 127-135

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.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 36
Serial Issue: 1
Title: 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
Title: Thematic set; Cyprideis torosa
Author(s): Horne, David J.Benardout, GinnyWhittaker, John E.
Author(s): Anonymous
Affiliation: Queen Mary University of London, School of Geography, London, United Kingdom
Pages: 127-135
Published: 2016
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 46
Accession Number: 2017-006378
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table, sketch maps
N51°15'00" - N51°45'00", E00°30'00" - E01°30'00"
Secondary Affiliation: Natural History Museum, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201705
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