Keuper marl

English Midlands and neighbouring areas e.g. Cheshire,^[1] Nottinghamshire,^[1] Devon, eastern Worcestershire and northern Yorkshire.^{[citation needed}

]
Typically red, or occasionally green or grey, these strata are generally featureless and contain few fossils. In basin formations, thick halite-bearing layers, or rock salt deposits, are sometimes present at the base of the marl.
In modern nomenclature, Keuper marl is included within the Mercia Mudstone Group.^[1]^[2]

References

^ ^a ^b ^c British Geological Survey: Lexicon of Named Rock Units: Mercia Mudstone Group (accessed 10 April 2010)

ISBN 1 86107 493 X
)

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[BGS-1] British Geological Survey: Lexicon of Named Rock Units: Mercia Mudstone Group (accessed 10 April 2010)

[2] ISBN 1 86107 493 X
)

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[2]