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Stratigraphy, depositional environments and palaeogeography of the Colwell Bay Member (Headon Hill Formation, Solent Group: Late Eocene, Hampshire Basin)

By
Chris King
Chris King
16A Park Road, Bridport, Dorset DT6 5DA, UK (email: chrking@globalnet.co.uk)
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Published:
January 01, 2010

Abstract

Detailed logging ofkey outcrops and boreholes in the mainly nearshore and marginalmarine sediments of the Colwell Bay Member has enabled regional correlations to be established. The Colwell Bay Member comprises a single depositional sequence, based by a combined sequence boundary and transgressive surface and terminated by a second sequence boundary. Regionally developed omission surfaces delimit five parasequences within the Colwell Bay Member. Environmentally controlled mollusc assemblages indicate progressive SW-to-NE progradation of marginal-marine environments within each parasequence. Previous interpretations of the Solent Group as deposited in a narrow embayment of the proto-English Channel are evaluated and rejected. It is interpreted as a remnant of a wide area of coastal and near-coastal sediments, deposited in a wide embayment of the southern North Sea Basin, now largely removed by mid-Tertiary uplift and erosion.

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Contents

The Micropalaeontological Society, Special Publications

Micropalaeontology, Sedimentary Environments and Stratigraphy: a Tribute to Dennis Curry (1912–2001)

Geological Society of London
Volume
4
ISBN electronic:
9781862396227
Publication date:
January 01, 2010

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