The BGS Lexicon of Named Rock Units — Result Details
Salperton Limestone Formation
| Computer Code: | SALS | Preferred Map Code: | SaL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Bajocian Age (JB) — Bathonian Age (JN) | ||
| Lithological Description: | Pale grey to brown rubbly, fine- to coarse-grained ooidal, peloidal and finely shell-detrital packstone to grainstone (Clypeus Grit Member), generally with very shelly and coarsely shell-detrital ooidal grainstone and packstone (Upper Trigonia Grit Member) at base. | ||
| Definition of Lower Boundary: | Disconformity: hardground capping various limestone members of Aston Limestone or Birdlip Limestone formations, or correlative disconformity on mudstone or sandstone formations of Lias Group. | ||
| Definition of Upper Boundary: | Upward change from ooidal, peloidal and finely shell-detrital limestone to mudstone (Fuller's Earth Formation) in southwest or into fine- to medium-grained ooidal grainstone (Chipping Norton Limestone Formation) in northeast. Generally transitional, but locally marked by a hardground (Sumbler et al., 2000). | ||
| Thickness: | Typically 10 to 15 m. Type section 13 m. Maximum c. 20 m (Colesbourne area). | ||
| Geographical Limits: | From south of Horton, Gloucestershire where it passes south into the ooid limestones of the Doulting Stone/Anabacia Limestone of the undivided Inferior Oolite Group (Green, 1992; see also Barron, et al., 1997, p 281, fig. 4 and Section 5.1), north through the Gloucestershire Cotswolds to north Oxfordshire west of a line from Hook Norton to Tackley where overlapped by the Great Oolite Group (Horton et al., 1987, fig. 26), although it may be present (Clypeus Grit Member) at depth further to the east (Horton et al., 1995, p. 10). | ||
| Parent Unit: | Inferior Oolite Group (INO) | ||
| Previous Name(s): | Upper Ragstones [Obsolete Name and Code: Use SALS]
(-1801)
Upper Inferior Oolite [Obsolete Name And Code: Use SALS] (UINO) Stroud Formation [Obsolete Name and Code: Use SALS] (-2407) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | North Cotswold Hills, Gloucestershire. | ||
| Type Section | Notgrove railway cutting SSSI, 1 km eastnortheast of Salperton, Gloucestershire (Beds 1-5 of Buckman, 1887, section 6 (first cutting west of Notgrove Station)). See also Woodward, 1894, p.133; Barron, 1998, Locality Q; Cox and Sumbler, 2002). | ||
| Reference Section | Harford railway cutting SSSI. Primary Reference Section. Buckman, 1887, sections 3 and 4; Richardson, 1929; Parsons, 1976; Barron, 1999; Cox and Sumbler, 2002. For further reference sections see Barron et al., 1997. | ||
| 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). | |||
| Barron, A J M, Lott, G K, and Riding, J B. 2012. Stratigraphical framework for the Middle Jurassic strata of Great Britain and the adjoining continental shelf. British Geological Survey Research Report RR/11/06. | |||
| Green, G W. 1992. Bristol and Gloucester region (3rd). British Regional Geology. (London: HMSO for British Geological Survey.) | |||
| Richardson, L. 1929. The Country around Moreton in Marsh. Memoir of the Geological Survey of Great Britain, Sheet 217 (England and Wales). | |||
| Cox, B M, and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] | |||
| Parsons, C F, 1976. Ammonite evidence for dating some Inferior Oolite sections in the North Cotswolds. Proceedings of the Geologists' Association, 87, 45-63. | |||
| Sumbler, M G, Barron, A J M and Morigi, A N, 2000. Geology of the Cirencester district. Memoir of the British Geological Survey, Sheet 235 (England and Wales). | |||
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. | |||
| Barron, A J M, Sumbler, M G and Morigi, A N. 1997. A revised lithostratigraphy for the Inferior Oolite Group (Middle Jurassic) of the Cotswolds, England. Proceedings of the Geologists' Association, Vol. 108, 269-285. | |||
| Barron, A J M. 1999. Geology of the Naunton area. British Geological Survey Technical Report WA/98/27. | |||
| Buckman, S S. 1901. Bajocian and contiguous deposits in the north Cotswolds: the main hill-mass. Quarterly Journal of the Geological Society of London, Vol. 57, 126-155. | |||
| Barron, A J M. 1998. Geology of the Hawling area: 1:10 000 Sheet SP02SE. British Geological Survey Technical Report WA/98/26. | |||
| Buckman, S S. 1887. The Inferior ooilte between Andoversford and Bourton-on-the-Water. Proceedings of the Cotteswold Naturalists' Field Club, Vol. 9, 108-135. | |||
| Buckman, S S. 1905. A monograph of the ammonites of the Inferior Oolite Series, Pt. 13, Supplement pp. clxix-ccix. | |||
| Horton, A, Poole, E G, Williams, B J, Illing, V C and Hobson, G D. 1987. Geology of the country around Chipping Norton. Memoir of the British Geological Survey, Sheet 218 (England and Wales). | |||
| Parsons, C F, 1980. Aspects of the statigraphy and ammonite faunas of the Aaenian-Bajocian stages in Great Britain. Unpublished PhD thesis, University of Keele. | |||
| Woodward, H B, 1894. The Jurassic Rocks of Britain, Vol.4. The Lower Oolitic Rocks of England (Yorkshire excepted). Memoir of the Geological Survey of the United Kingdom. | |||
| Arkell, W J. 1933. The Jurassic System in Great Britain (Oxford: Clarendon Press.) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E218 E234 E235 E251 E217 | |||