Keupermarl is a former and now deprecated term for multiple layers ofmudstone andsiltstone ofTriassic age which occur beneath parts of theEnglish Midlands and neighbouring areas e.g.Cheshire,[1]Nottinghamshire,[1]Devon, easternWorcestershire and northernYorkshire.[citation needed]
Typically red, or occasionally green or grey, these strata are generally featureless and contain few fossils. In basin formations, thickhalite-bearing layers, or rock salt deposits, are sometimes present at the base of the marl.
In modern nomenclature, Keuper marl is included within theMercia Mudstone Group.[1][2]
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