The BGS Lexicon of Named Rock Units — Result Details
Stanford Formation
| Computer Code: | STFD | Preferred Map Code: | St |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Oxfordian Age (JO) — Oxfordian Age (JO) | ||
| Lithological Description: | Shell detrital limestones, ooidal limestone, coralline limestone, fossiliferous marls, and interbedded limestone, marl and mudstone. | ||
| Definition of Lower Boundary: | Top of highest sandy lithology of underlying Kingston Formation (or silty mudstone of West Walton Formation, where the former is absent) above which succession is dominated by (non-sandy) limestone and/or marl; generally sharp and non-sequential boundary, commonly marked by pebble bed. | ||
| Definition of Upper Boundary: | Top of limestone and/or marl-dominated succession succeeded by grey mudstones and silty mudstone of Ampthill Clay Formation; generally a sharp, non-sequential boundary. Locally unconformably succeeded by Lower Cretaceous (Lower Greensand Group). | ||
| Thickness: | 0 to 26 m (Oxford area); up to c. 15 m (Calne-Swindon area). | ||
| Geographical Limits: | Westbury, Wilts (where overstepped by Lower Cretaceous) to Waddesdon, near Aylessbury, Bucks (where wedges out into Ancholme Group; Horton et al., 1995). | ||
| Parent Unit: | Corallian Group (CR) | ||
| Previous Name(s): | Wheatley Limestone, Oakley and Littlemore Members [Obsolete Name and Code: Use STFD]
(-1203)
Upper Corallian Limestones (-546) Calne Freestone and Coral Rag [Obsolete Name and Code: Use STFD] (-1843) Wheatley Limestone and Faringdon Members [Obsolete Name and Code: Use STFD] (-1844) Cumnor Formation [Obsolete Name And Code: Use STFD] (CUMR) Osmington Oolite Series [Obsolete Name and Code: Use COO, OSS, STFD, STOU] (-1450) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | The 'Corallian Ridge' between the rivers Thames and Ock (Vale of White Horse); approximately Swindon to Oxford. | ||
| Type Section | Shellingford Crossroads Quarry, near Stanford in the Vale, Oxon (Arkell, 1947, p. 87; McKerrow and Kennedy, 1973; Coe, 1995; Goldring et al., 1998; Cox, B M and Wright, J K. 2001). | ||
| Reference Section | British Geological Survey Cumnor (Henwood Farm) Borehole (SP40SE/11), 11.94 m to 20.35 m depth. (Horton, 1978; Horton et al., 1995) | ||
| Reference Section | British Geological Survey Garsington Borehole (SP50SE/49), 10.31 m to 21.60 m depth. (Horton et al., 1995). | ||
| Reference Section | Harwell No. 3 (HW3) Borehole (SU48NE/92), 192.58 m to 196.80 m depth. (Gallois and Worssam, 1983). | ||
| Reference Section | British Geological Survey Uffington (Manor Farm) Borehole (SU38NW/1), 51.76 m to 56.08 m depth. (Poole and Kelk,1971). | ||
| Reference Section | Cross Roads Quarry, New Headington, Oxford (Horton et al., 1987; Cox, B M and Wright, J K. 2001). | ||
| Reference(s): | |||
| Arkell, W J. 1947. The Geology of Oxford. 267pp. (Oxford: Clarendon Press.) | |||
| Wright, J K, 1980. Oxfordian Correlation Chart. "In" Cope, C J W, (Editor). A correlation of Jurassic rocks in the British Isles, Part two: Middle and Upper Jurassic. Geological Society of London Special Report No.15. (p.61-76 in Correlation Chart). | |||
| McKerrow, W S and Kennedy, W J. 1973. The Oxford district. Geologists' Association Guide No.3. | |||
| Arkell, W J. 1951. The geology of the Corallian ridge between Wootton Bassett and Lyneham, Wiltshire. Wiltshire Archaeological and Natural History Magazine, Vol. 54, 1-18. | |||
| Callomon, J H. 1960. New sections in the Corallian Beds around Oxford and the subzones of the Plicitalis Zone. Proceedings of the Geologists' Association, Vol. 71, p. 177-208. | |||
| Coe, A L. 1995. A comparison of the Oxfordian successions of Dorset, Oxfordshire and Yorkshire. 151-172 in Taylor, P D (Ed.) Field Geology of the British Jurassic. [Bath: The Geological Society.] | |||
| 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.) | |||
| Gallois, R W and Worssam, B C. 1983. Stratigraphy of the Harwell boreholes. Institute of Geological Sciences Report FLPU 83-14. | |||
| 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). | |||
| Poole, E G, and Kelk, B. 1971. Calcium montmorillonite (fuller's earth in the Lower Greensand of the Baulking area, Berkshire. Institute of Geological Sciences Report 71/4. | |||
| Arkell, W J. 1941. Map of the Corallian Beds around Highworth, Wiltshire. Proceedings of the Geologists' Association, Vol. 52, 79-109. | |||
| Arkell, W J. 1941. Map of the Corallian Beds around Purton, Wiltshire. Wiltshire Archaeological and Natural History Magazine, Vol. 49, 274-282. | |||
| 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. | |||
| Golding, R, Layer, M G, Magyari, A, Palotas, K and Dexter, J. 1998. Facies variation in the Corallian Group (U. Jurassic) of the Faringdon-Shellingford area (Oxfordshire) and the rockground base to the Faringdon Sponge Gravels (L. Cretaceous). Proceedings of the Geologists' associatio;n, Vol. 109, p. 115-125. | |||
| Horton, A. 1978. The Cumnor (Henwood Farm) Borehole. p.4 in Institute of Geological Sciences Boreholes. 1976. Institute of Geological Sciences Report 77/10. | |||
| Arkell, W J. 1939. Map of the Corallian Beds between Marcham and Faringdon, Berkshire. Proceedings of the Geologists' Association, Vol. 50, 487-509. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E236 E237 E252 E253 E265 E266 E281 | |||