The BGS Lexicon of Named Rock Units — Result Details

Notgrove Member

Computer Code: NGRV Preferred Map Code: Ng
Status Code: Full
Age range: Bajocian Age (JB) — Bajocian Age (JB)
Lithological Description: Pale brownish grey, poorly sorted medium- to coarse-grained peloidal and ooidal grainstone, typically poorly sorted or bimodal; medium-bedded and cross-bedded, shells and shell debris rare, except in lowest beds.
Definition of Lower Boundary: Upward transition from very shelly, shell-detrital limestone (Gryphite Grit Member) into limestone as described in lithology.
Definition of Upper Boundary: Hardground: limestone as described in lithology overlain by shelly, sandy, ironshot limestone (Rolling Bank Member), or by Salperton Limestone Formation.
Thickness: 0 - 13m. Type section (Notgrove Cutting); 3.9m (Buckman, J, 1887).
Geographical Limits: Mid and north Cotswolds: north of Colesbourne and Chedworth, and west of Cold Aston and Condicote. Barron, A J M, et al, 1997, fig.4.
Parent Unit: Aston Limestone Formation (ASLS)
Previous Name(s): Notgrove Oolite (-1083)
Notgrove Freestone (-1726)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  North Cotswolds, Gloucestershire. See Barron et al., 1997 for further reference sections. 
Type Section  Notgrove railway cutting SSSI, northeast of Salperton, Gloucestershire. First cutting west of Notgrove Station of Buckman, J, 1887, p.123; Barron, A J M, 1998, appendix 1, locality Q; Cox, B M, and Sumbler, M G. 2002. 
Reference Section  'Tumulus' railway cutting, Chedworth Woods, Gloucestershire. Cutting K of Woodward, H B, 1894, fig.42. Buckman, J, 1895, section 25, bed 1; Sumbler, M G and Barron, A J M, 1995, appendix 1, locality A, beds 16-17. For further reference sections see Barron, A J M, et al, 1997. 
Reference(s):
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, 1998. Geology of the Hawling area: 1:10 000 Sheet SP02SE. British Geological Survey Technical Report WA/98/26. 
Buckman, S S, 1895. The Bajocian of the mid-Cotswolds. Quarterly Journal of the Geological Society of London, Vol.51, 388-445; 458-462. 
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). 
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. 
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. 
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. 
Sumbler, M G and Barron, A J M, 1995. Geological notes and local details for 1: 10 000 Sheet SP01SE (Chedworth). British Geological Survey Technical Report, WA/95/73. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E235 E217