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 members of Aston Limestone or Birdlip Limestone formations, or correlative disconformity on Lias Group.
Definition of Upper Boundary: Upward change 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, M G, Barron, A J M and Morigi, A N, 2000).
Thickness: Typically 10 to 15m. Type section 13m. Maximum c.20m (Colesbourne area).
Geographical Limits: Horton, northeast Avon (Green, G W, 1992; see also Barron, A J M, et al, 1997, p.281, fig.4), through Gloucestershire Cotswolds to north Oxfordshire west of a line from Hook Norton to Tackley where overlapped by Great Oolite Group (Horton, A, Poole, E G, Williams, B J, Illing, V C and Hobson, G D, 1987, fig.26).
Parent Unit: Inferior Oolite Group (INO)
Previous Name(s): Upper Inferior Oolite [Obsolete Name And Code: Use SALS] (UINO)
Stroud Formation (-2407)
Upper Ragstones (-1801)
Alternative Name(s): none recorded or not applicable
Type Section  Notgrove railway cutting SSSI, 1km eastnortheast of Salperton, Gloucestershire. (Beds 1-5 of Buckman, S S, 1887, section 6 (first cutting west of Notgrove Station)). See also Woodward, H B, 1894, p.133; Barron, 1998, Locality Q; Cox, B M, and Sumbler, M G. 2002). 
Type Area  North Cotswold Hills, Gloucestershire. 
Reference Section  Harford railway cutting SSSI. Primary Reference Section. Buckman, S S, 1887, sections 3 and 4; Richardson, L, 1929; Parsons, C F, 1976; Barron, A J M, 1999; Cox, B M, and Sumbler, M G. 2002. For further reference sections see Barron, A J M, et al, 1997. 
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). 
Richardson, L. 1929. The Country around Moreton in Marsh. Memoir of the Geological Survey of Great Britain, Sheet 217 (England and Wales). 
Green, G W. 1992. Bristol and Gloucester region (3rd). British Regional Geology. (London: HMSO for British Geological Survey.) 
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. 
Cox, B M and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E218 E234 E235 E251 E217