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Geological Society, London, Special Publications; 1996; v. 101; p. 185-193;
DOI: 10.1144/GSL.SP.1996.101.01.11
© 1996 Geological Society of London

Regional Studies: Stratigraphy, Tectonics and Volcanism

Recognition of Chron C25n in the upper Paleocene Upnor Formation of the London Basin, UK

Richard A. Ellison1, Jason R. Ali2, Nicolette M. Hine3 & David W. Jolley3

1 British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
2 Department of Oceanography, University of Southampton, Southampton SO9 5NH, UK
3 Industrial Palynology Unit, Sheffield University, Mappin Street, Sheffield S1 3JD, UK

Lithostratigraphic studies of four borehole cores drilled through the late Paleocene Lambeth Group (Upnor, Woolwich and Reading Formations) and basal London Clay Formation of central London have been supplemented with palaeomagnetic, calcareous nannoplankton and palynological data. The Woolwich and Reading Formations and the lower London Clay Formation are reversely magnetized and were deposited during the early part of Chron C24r. The first record of both NP9 and Chron C25n, hitherto missing from the Paleogene record in southern England, has been identified in the Upnor Formation (formerly the Woolwich Bottom Bed). It provides a key reference marker for linking events associated with the Paleocene-Eocene boundary (positioned within Chron C24r) to the type area of the internationally recognized Thanetian and Ypresian Stages.