The Ribblesdale fold belt, NW England—a Dinantian-early Namurian dextral shear zone

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Abstract
Summary: Folds and faults in various en échelon patterns affect the Tournaisian-early Namurian sedimentary rocks of the Craven basin, a rift basin which includes Dinantian and possibly late Devonian strata some 5 km thick. The structures are interpreted as a response to regional dextral shear, which accompanied sedimentation from mid-Dinantian to early Namurian times at least. The principal Ribblesdale folds are viewed as products, in the Carboniferous cover, of primary wrenching on inherited fractures in the Lower Palaeozoic basement. Some en échelon sets of minor folds are regarded as products of secondary wrenching in the axial zones of ‘primary’ folds. The block-basin transition zone south of the North Craven fault appears to have been affected by dextral transtension during the late Brigantian (late Dinantian).
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