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Geology of the Brixton Deverill - East Knoyle district (Wiltshire), 1:10000 sheets ST83NE (Brixton Deverill) and ST83SE (East Knoyle) : part of 1:50000 sheet 297 (Wincanton)

By C.R. Bristow


The Brixton Deverill-East Knoyle d i s t r i c t lies at the western endof Salisbury\ud Plain and encompasses the north-western part of the Vale of Wardour. The\ud central part of the d i s t r i c t forms part of a dissected plateau developed on\ud Upper Chalk (Figure 1); this reaches a maximum height of 238 m south-east of\ud Brixton Deverill. In the north-west, there are prominent escarpments capped\ud by the Lewes Chalk on either side of the Wylye valley. In the south, the Mere\ud Fault and associated monoclinal structure play an important part in shaping\ud the landscape. In the west, the chalk rises steeply on the north side of the\ud fault from the clay vale to the south. Between West Knoyle and East Knoyle,\ud the steeply dipping Upper Greensand and Chalk strata give rise to strongly\ud featured ground.\ud The principal drainage in the northern part of the d i s t r i c t is\ud northwards by the River Wylye, the only permanent river on the chalk outcrop\ud and its tributaries. In the south-central area, drainage is eastwards by a\ud series of valleys that coalesce just west of Hindon and ultimately join the\ud River Nadder at Tisbury. In the south, on the clay vale, drainage is southwestwards\ud by tributaries of the River Lodden, and south-eastwards by\ud tributaries of the River Nadder. The lowest point in the d i s t r i c t , c.96 m OD,\ud lies in the southern tract.\ud Soils developed on the Upper Greensand and most of the Chalk are light\ud and w e l l drained. However, s o i l s on the West Melbury Chalk, together with some\ud on the clay-with-flint deposits and Kimmeridge Clay are much heavier and\ud poorly drained.\ud Agriculture is a mixture of arable and pasture, with the latter dominant\ud on the Kimmeridge Clay Vale. There are few woods, with deciduous woods\ud confined mostly to the clay vale and the relatively newly planted coniferous\ud plantations on the Chalk and Upper Greensand. Agriculture is the only industry\ud in the area

Publisher: British Geological Survey
Year: 1995
OAI identifier:

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