The BGS Lexicon of Named Rock Units — Result Details
Bathampton Down Member
Computer Code: | BDW | Preferred Map Code: | BD |
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Status Code: | Full | ||
Age range: | Pleistocene Epoch (QP) — Pleistocene Epoch (QP) | ||
Lithological Description: | Gravelly sandy clay or clayey sandy gravel, with flint, quartz, chert (Lower Cretaceous and Carboniferous), limestone (Jurassic and Carboniferous) and other exotic pebbles. May be crudely stratified. | ||
Definition of Lower Boundary: | Rests unconformably on formations of the Middle Jurassic Great Oolite Group, in places in hollows above, or within fissures or cavities in Great Oolite Group limestone formations. | ||
Definition of Upper Boundary: | Generally at surface. Cavity fills (effectively speleothems) may be apparently overlain by bedrock (see Donovan, 1995). | ||
Thickness: | Mapped deposits very thin - less than 2m. Thickness of fissure fills unknown but may be up to at least 1.8m. | ||
Geographical Limits: | Plateau areas around 130 to 200m above OD to the south and east of Bath city, Somerset, including around Bath University, Claverton Down, at Limpley Stoke and at Farleigh Down. A poorly located occurrence at Kingsdown. See Donovan, 1995. | ||
Parent Unit: | Kenn Formation (KNN) | ||
Previous Name(s): | Head
(HEAD)
Sand and gravel of unknown age [Obsolete Name and Code: Use SGAO] (SGU) Head (HEAD) Sand and gravel of unknown age [Obsolete Name and Code: Use SGAO] (SGU) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Bath University approach road. Fissure fills visible within Chalfield Oolite Formation strata in west wall of cutting. Hawkins and Kellaway, 1971. | ||
Type Area | Bathampton Down. Various occurrences in pockets and fissure fills described by Donovan, 1995. | ||
Reference(s): | |||
Campbell, S, Hunt, C O, Scourse, J D, Keen, D H and Croot, D G. 1999. Southwest England. 66-78 in Bowen, D Q (Editor), A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report No.23. [London: Geological Society.] | |||
Hawkins, A B, and Kellaway, G A. 1971. Field Meeting at Bristol and Bath with special reference to new evidence of glaciation. Proceedings of the Geologists' Association, Vol.82, 267-291. | |||
Hunt, C O. 1998. The Quaternary history of the Avon valley and Bristol district. Chapter 10 in Quaternary of south-west England. Campbell, S, Hunt, C O, Scourse, J D, Keen, D H, and Stephens, N (editors). Geological Conservation Review Series. No.14. (Peterborough: Joint Nature Conservation Committee/Chapman and Hall.) | |||
Donovan, D T. 1995. High level drift deposits east of Bath. Proceedings of the University of Bristol Spelaeological Society, Vol. 20, 109-126. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E265 E281 |