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Geological Society, London, Special Publications; 1996; v. 101; p. 129-144;
DOI: 10.1144/GSL.SP.1996.101.01.09
© 1996 Geological Society of London

Regional Studies: Stratigraphy, Tectonics and Volcanism

Chronostratigraphic framework for the Thanetian and lower Ypresian deposits of southern England

Jason R. Ali1 & David W. Jolley2

1 Department of Oceanography, The University, Southampton SO9 5NH, UK Earth Sciences, UNIMAS, 94300 Kota Samarhan, Sarawak, Malaysia
2 Centre for Palynological Studies, The University, Sheffield S1 3JD, UK

Magnetostratigraphic and palynomorph data are used to assess the timing and nature of the late Paleocene-earliest Eocene depositioanl sequences of SE England. Ormesby Clay Formation mudstones in east Norfolk are the oldest upper Paleocene deposits (C26r) of southern England. The base of the type Thanet Sand Formation (= start of the Thanetian Stage) is c. 0.65 million years younger (C26n). A subaerial erosion surface separates the Thanet-Ormesby package from the Lambeth Group sediments. The duration of the hiatus (>0.5 million years) separating the two units can be calculated from the magnetostratigraphic data; C25n is missing from the stratigraphic record across almost all of southern England. However, the Upnor Formation in central London contains a record of C25n. A hiatus of c. 0.4 million years separates the late Paleocene Lambeth Group from the early Eocene Harwich Formation. The Lambeth Group, Harwich Formation and lower London Clay Formation were all deposited during C24r. The start of Chron C24n.3n is positioned at the base of Division B of the London Clay Formation.