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Geology of the Aust-Beachley District, Gloucestershire
Published online by Cambridge University Press: 01 May 2009
Abstract
The folds and many of the faults in the Keuper Marls of the Aust-Beachley District are claimed to be compaction phenomena. The distribution of almost vertical sheets of alabaster in the Keuper Marls is attributed to infilling of contraction cracks. The palaeontology of the Carboniferous rocks, particularly of the seldom-visited islands of the Severn, is used to determine the structure. Several post-Triassic faults of tectonic origin have been mapped and others predicted; the age of the faulting is unknown.
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page 365 note 1 The limits of the estuary are difficult to define but the pilotage areas for the Bristol Channel and the Severn Estuary are considered navigationally to join at King Road, Avonmouth. Physiographically the argument could be made that the estuary extends from Gloucester as far as a line drawn from Morte Point to Worms Head, a distance of 117 miles as measured along the river.
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