M. BROOKS, R. H. AL-SAADI; Seismic refraction studies of geological structure in the inner part of the Bristol Channel. Journal of the Geological Society ; 133 (5): 433–445. doi: https://doi.org/10.1144/gsjgs.133.5.0433
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Nine E–W seismic refraction lines about 12 km long provide information on the thickness and structure of the Mesozoic succession in the inner Bristol Channel area. About 2000 m of mainly Jurassic strata occupy the Bristol Channel syncline north of Foreland Point but this structure attenuates eastwards and is replaced by the Glastonbury syncline which contains nearly 800 m of Mesozoic strata under Bridgwater Bay. The Central Bristol Channel fault zone has been traced eastwards towards Bridgwater Bay, and has a southerly downthrow of several hundred metres in mid-Channel north of Porlock. There is some evidence for an early phase of movement along the fault zone, bringing Lower Palaeozoic against Upper Palaeozoic rocks.