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 Ragstones (-1801)
Upper Inferior Oolite [Obsolete Name And Code: Use SALS] (UINO)
Stroud Formation (-2407)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  North Cotswold Hills, Gloucestershire. 
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). 
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. 
Reference(s):
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). 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
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, 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. 
Cox, B M and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E218 E234 E235 E251 E217