Craven_Group

Craven Group

Craven Group

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The Craven Group is a lithostratigraphical term referring to the succession of mudstone and limestone rock strata which occur in certain parts of northern and central England and northeast Wales in the United Kingdom within the Chadian to Yeadonian sub-Stages of the Carboniferous Period. Other lithologies including sandstones, siltstones and chert occur within the group.[1] The Group is subdivided into numerous formations, some of which previously enjoyed group status. In stratigraphic order (uppermost/youngest at top), these are:

  • Bowland Shale Formation (mudstone and siltstone)
  • Pendleside Limestone Formation (interbedded limestone and mudstone, conglomerate)
  • Hodderense Limestone Formation
  • Hodder Mudstone Formation (limestone and mudstone)

Quick Facts Type, Sub-units ...

The Craven Group unconformably overlies the Bowland High Group and elsewhere the Clwyd Limestone Group. It is succeeded (overlain) by the Millstone Grit Group[2]

References

  1. [1]
    http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=CRAV BGS Lexicon of named rock units: Craven Gp
  2. [2]
    British Geological Survey 1:625,000 scale geological map Bedrock geology: UK South (5th edn) BGS, Keyworth, Notts

See also

Geology of Lancashire


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