Evidence for structural controls on the deposition of the late Jurassic-early Cretaceous Purbeck Limestone Group, Dorset, southern England

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    Abstract

    Integration of field studies with subsurface data demonstrate that deposition of the late Jurassic-early Cretaceous Purbeck Limestone Group occurred under semi-arid conditions during an important phase of synsedimentary extensional activity in the Wessex Basin. Use of structural restorations and neotectonic analogue-studies support the introduction of a new model to account for the regional and local along-strike variability in deposition of the Purbeck Limestone Group. It is proposed that the segmented nature of the episodically-active, basin-bounding Purbeck Fault explains observed thickness and sedimentological variations, including lateral facies changes and clast reworking. In addition to affording a tectonic framework in which to understand the rich palaeontological assemblages, the new depositional model also provides a mechanism for explaining the rapid death and unusual preservation of conifer forests through rapid submergence following co-seismic activity on the normal fault system.
    Original languageEnglish
    Title of host publicationLife and Environments in Purbeck Times
    EditorsAndrew R Milner, David J Batten
    Place of PublicationLondon
    PublisherPalaeontological Association
    Pages21-40
    Number of pages20
    ISBN (Print)9780901702739
    Publication statusPublished - Dec 2002

    Publication series

    NameSpecial papers in palaeontology
    Volume68
    ISSN (Print)0038-6804

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  • Cite this

    Underhill, J. R. (2002). Evidence for structural controls on the deposition of the late Jurassic-early Cretaceous Purbeck Limestone Group, Dorset, southern England. In A. R. Milner, & D. J. Batten (Eds.), Life and Environments in Purbeck Times (pp. 21-40). (Special papers in palaeontology; Vol. 68). Palaeontological Association.