The Namurian of the Lancaster Fells

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Abstract
Summary: The Lancaster Fells are situated in the northern part of the Central Province and the Namurian sequence resembles that of the similarly placed Rombalds Moor region. The marine Upper Bowland Shales are at the base and rest conformably on the Lower Bowland Shales (Lower Carboniferous). Together with the succeeding Bowland Grit Group, 1200 feet thick, they make up the Pendleian Stage (E 1 ). The E. bisulcatum marine band marks the base of the Arnsbergian (E 2 ) and is followed by the Roeburndale Grit Group, 600 feet thick, which is in turn succeeded by the important Caton Shales ( Ct. nitidus Zone). The upper part of the sequence is much thinner than in other areas. The Sabdenian (H) has but one marine band ( H. beyrichianum ) and a succeeding thin sandstone. The Kinderscoutian (R 1 ) starts with brachiopod beds, follows with two Reticuloceras marine bands and has red sandstones near the top. The Marsdenian (R 2 ), with R. gracile at the base, has similar red sandstones, whilst the Yeadonian (G 1 ), only exposed farther north in the Greta valley, contains the G. cancellatum and G. cumbriense marine bands. The structure consists of a broad asymmetric synclinal area with steep dips on the flanks and gentle northerly dips in the axial regions. The dominant trend of the faults is north-westerly and the downthrows south-westerly.

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