The BGS Lexicon of Named Rock Units — Result Details
Oakley Member
Computer Code: | OKLY | Preferred Map Code: | Oa |
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Status Code: | Full | ||
Age range: | Oxfordian Age (JO) — Oxfordian Age (JO) | ||
Lithological Description: | Interbedded pale grey marls, silty, argillaceous micritic limestones, siltstones and silty to sandy mudstones, commonly containing scattered ferruginous ooids, and locally rich in Nanogyra nana and serpulids. | ||
Definition of Lower Boundary: | A marked, and generally sharp, non-sequential, lithological change from sand or sandstone of the Beckley Sand or Arngrove Spiculite members of the Kingston Formation, or silty mudstones of the West Walton Formation. | ||
Definition of Upper Boundary: | An upward change to mudstones of the West Walton Formation or Ampthill Clay Formation. | ||
Thickness: | Up to about 5 m thick. | ||
Geographical Limits: | Around Wheatley to Westcott, north-east of Oxford, restricted to 1:50 000 sheet 237 (see inset map for south-west limit). Similar facies which occur at the same horizon farther north-east; e.g. sheets 219, 220 and 203 are not Oakley Member, but should be treated as part of the West Walton Formation. | ||
Parent Unit: | Stanford Formation (STFD) | ||
Previous Name(s): | Oakley Clay [Obsolete Name and Code: Use OKLY]
(-2352)
Exogyra Nana Beds [Obsolete Name and Code: Use OKLY] (-1741) Exogyra Nana Clay [Obsolete Name and Code: Use OKLY] (-1742) Exogyra Nana Zone [Obsolete Name and Code: Use OKLY] (-1743) Oakley Beds [Obsolete Name and Code: Use OKLY, ELR] (-1526) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Reference Section | Primary reference: Brill No. 1 Birehole (SP61SE/10) 102.58 to 106.06. | ||
Type Area | Oakley, near Brill, Bucks. | ||
Reference Section | Railway cutting between Dorton and Ashendon Junction. Davies. In: Arkell, 1927. | ||
Reference(s): | |||
Cox, B M, and Wright, J K. 2001. British Upper Jurassic stratigraphy (Oxfordian to Kimmeridgian). Geological Conservation Review Series, No. 21. (Peterborough: Joint Nature Conservation Committee.) | |||
Wright, J K and Cope, J C W. In press. Oxfordian - Kimmeridgian Correlation Chart. In: A correlation of Jurassic rocks in the British Isles: Middle and Upper Jurassic. Cope, J C W (editor). Special Report of the Geological Society of London. | |||
Horton, A, Sumbler, M G, Cox, B M and Ambrose, K, 1995. Geology of the country around Thame. Memoir of the British Geological Survey, Sheet 237 (England and Wales). | |||
Buckman, S S, 1927. Type Ammonites, Vol.6. (London: S S Buckman) | |||
Davies, A M. 1907b. Excursion to Dorton, Brill and Arngrove. Proceedings of the Geologists' Association, Vol. 20, 183-186. | |||
Arkell, W J. 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] | |||
Arkell, W J. 1947. The Geology of Oxford. 267pp. [Oxford: Clarendon Press.] | |||
Arkell, W J. 1927. The Corallian rocks of Oxford, Berkshire and north Wiltshire. Philosophical Transactions of the Royal Society of London, Vol. B216, 67-181. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E237 |