The BGS Lexicon of Named Rock Units — Result Details

Wheatley Limestone Member

Computer Code: WYLS Preferred Map Code: WL
Status Code: Full
Age range: Oxfordian Age (JO) — Oxfordian Age (JO)
Lithological Description: Shell-fragmental, biosparite grainstones interbedded with shell-fragmental marls, locally with rubbly coralliferous limestone with marls of the 'Coral Rag' facies.
Definition of Lower Boundary: A sharp, upward non-sequential transition from sand and sandstone of the Beckley Sand Member of the Kingston Formation, to shell-fragmental limestone, generally with very little quartz sand, except in the reworked basal bed, which may otherwise be marked by a shelly conglomeratic bed with or without a shelly marl.
Definition of Upper Boundary: Sharp, upward non-sequential change to grey mudstones of the Ampthill Clay Formation.
Thickness: Up to 26 m thick.
Geographical Limits: The Oxford area and from Wheatley to Cumnor as shown on 1:50 000 sheets 236 and 237. The southern and western extents are uncertain, but are likely to extend as far as Faringdon (sheet 253) ,and possibly towards Swindon and Calne too.
Parent Unit: Stanford Formation (STFD)
Previous Name(s): Coral Rag (-2706)
Wheatley Limestone (-3781)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Primary reference: Lye Hill Quarry, Wheatley. Horton et al., 1995. 
Reference Section  BGS Cumnor (Henwood Farm) Borehole (SP40SE/11), 11.94 - 20.35 m depth. Coral Rag facies; Horton et al., 1995. 
Type Area  Quarries in Wheatley village, e.g. Gaol House Quarry. Arkell, 1927. 
Reference(s):
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). 
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.) 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
Pringle, J. 1926. The geology of the country around Oxford, (2nd edition). Memoir of the Geological Survey of Great Britain. 
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. 
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. 
Arkell, W J. 1947. The Geology of Oxford. 267pp. [Oxford: Clarendon Press.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E237 E236 E253