Recent long seismic lines in South Wales and the Bristol Channel indicate a structural culmination under the southern part of the Bristol Channel, where a layer with a seismic velocity of 6.1 km/s approaches to about 2 km of the surface. It is shown that the gravity field across Exmoor and the Bristol Channel can be explained by a simple geological model in which a thick sequence of relatively low density Lower Palaeozoic or late Precambrian rocks occupies the core of this culmination. The model casts further doubt on the existence of a major thrust under Exmoor.

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