Bovey Formation

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Bovey Formation
Stratigraphic range: Eocene–Oligocene
TypeGeological formation
Unit ofnone defined
Sub-unitsLappathorn Member, Abbrook Clay and Sand Member, Southacre Clay And Lignite Member
UnderliesAlluvium
OverliesAller Gravel Formation
Thicknessup to 1,200 metres (3,940 ft)
Lithology
PrimaryClay, Lignite, Sand
Location
RegionEurope
Country UK
ExtentDevon

The Bovey Formation is a deposit of sands, clays and lignite, probably over 1000 feet thick.[1] It lies in a sedimentary basin termed the Bovey Basin which extends from Bovey Tracey to Newton Abbot in South Devon, England.[2] The Bovey Basin lies along the line of the Sticklepath fault and owes its existence to subsidence along this fault.

The deposit is the result of the degradation of the neighbouring Dartmoor granite;[2] it was laid down in river flood plains and lakes during the late Eocene and Oligocene periods. Most of the fossilised plant material in the lignite is from Sequoia couttsiae.

The Bovey Formation is the major source in England for ball clay – a highly plastic fine-grained kaolinitic sedimentary clay typically used by the pottery industry. Large excavations have been made for the extraction of these clays. In the past, the lignite or "Bovey Coal" was burned in local kilns; steam engines; and workmen's cottages. It was, however, not economical.[2]

References[edit]

  1. ^ Selwood, E.B; et al. (1984). British Geological Survey: Geology of the country around Newton Abbot. London: HMSO. p. 130. ISBN 0-11-884274-9.
  2. ^ a b c  One or more of the preceding sentences incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). "Bovey Beds". Encyclopædia Britannica. 4 (11th ed.). Cambridge University Press. p. 337. This cites:
    • S. Gardiner, Q. J. G. S, London, xxxv., 1879
    • W. Pengelly and O. Heer, Phil. Trans., 1862
    • C. Reid, Q. J. G. S. lii., 1896, p. 490, and loc. cit. liv., 1898, p 234.
    • A. W. Clayden, The History of Devonshire Scenery (London, 1906), pp. 159-168