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The Portland-Purbeck junction (Portlandian-Berriasian) in the Weald, and correlation of latest Jurassic-early Cretaceous rocks in southern England

Published online by Cambridge University Press:  01 May 2009

W. A. Wimbledon  and
C. O. Hunt
W. A. Wimbledon
Affiliation:
Geological Conservation Review Unit, Nature Conservancy Council, Pearl House, Bartholomew Street, Newbury, Berks, U.K.
C. O. Hunt
Affiliation:
Department of Geography, Llandinam Building, University College of Aberystwyth, Wales
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Summary

Ammonites and palynology are described at the Portland-Purbeck junction in the Weald. A major disconformity exists between glaucolithus Zone Portland Beds and the overlying basal Purbeck facies, the basal Purbeck Beds of the Weald are correlated with the Middle Purbeck strata of Dorset. The Cinder Bed of Dorset and Wiltshire is described as one of several marine incursions entering Wessex from further south in the Anglo-Paris basin, not from the Spilsby basin. The use of Cinder Bed as a convenient Jurassic-Cretaceous (Portlandian-Ryazanian) boundary is critically reviewed, as is the placing of the base of the Berriasian Stage in the type Purbeck section. The rival biostratigrahic schemes based on ostracods and palynology are discussed and the discrepancies between the two schemes in southern England are examined.

Type
Articles
Information
Geological Magazine , Volume 120 , Issue 3 , May 1983 , pp. 267 - 280
Copyright
Copyright © Cambridge University Press 1983

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