The BGS Lexicon of Named Rock Units — Result Details

Eyford Member

Computer Code: EYF Preferred Map Code: Ey
Status Code: Full
Age range: Bathonian Age (JN) — Bathonian Age (JN)
Lithological Description: Pale grey, fissile, finely ooidal grainstone interbedded with grey, laminated fissile calcareous sandstone, locally decalcified to loose orange-brown sand, with minor beds of shelly and shell-fragmental limestone, marl or fissile mudstone.
Definition of Lower Boundary: Base of limestone/sandstones as described in lithology, resting on fissile mudstone of underlying un-named unit of Fuller's Earth Formation.
Definition of Upper Boundary: Sharp generally erosive base of coarse-grained ooidal grainstone of Taynton Limestone Formation.
Thickness: 0 to 7m; 6 to7m in type section.
Geographical Limits: Chedworth area, Gloucestershire (where it passes westwards into mudstone of the Fuller's Earth), eastwards to the Burford area, Oxon (where it passes into the Charlbury Formation).
Parent Unit: Fuller's Earth Formation (FE)
Previous Name(s): Eyford Sandstone Member (-2179)
Stonesfield Slate (SSL)
Cotswold Slates (-898)
Stonesfield Slate Series (-899)
Stonesfield Beds (-1536)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  North Cotswolds, west of Stow-on the Wold (Sevenhampton-Naunton-Condicote area). Richardson, L, 1929. 
Type Section  Huntsman's Quarry SSSI. Richardson, L, 1929. Ager, D V, et al, 1973. Cox, B M, and Sumbler, M G. 2002. 
Reference Section  Hampen Railway Cutting. Barron, A J M, 1998. 
Reference(s):
Wyatt, R J. 1996. A correlation of the Bathonian (Middle Jurassic) succession between Bath and Burford, and its relation to that near Oxford. Proceedings of the Geologists' Association, Vol. 107, 299-322. 
Richardson, L. 1929. The Country around Moreton in Marsh. Memoir of the Geological Survey of Great Britain, Sheet 217 (England and Wales). 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
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. 
Cox, B M and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] 
Ager, D V, Donovan, D T, Kennedy, W J, McKerrow, W S, Mudge, D C, and Sellwood, B W. 1973. The Cotswold Hills. Geologists' Association Guide. No. 36. (Colchester: Benham and Co.) 
Barron, A J M, 1998. Geology of the Hawling area: 1:10 000 Sheet SP02SE. British Geological Survey Technical Report WA/98/26. 
Sellwood, B W and Mc Kerrow, W S. 1974. Depositional environments in the lower part of the Great Oolite Group of Oxfordshire and north Gloucestershire. Proceedings of the Geologists' Association, Vol.85, 189-210. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E235 E217