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 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. 
Type Area  North Cotswolds, Gloucestershire. See Barron et al., 1997 for further reference sections. 
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:
E217 E235