The BGS Lexicon of Named Rock Units — Result Details

Rolling Bank Member

Computer Code: ROBA Preferred Map Code: RoB
Status Code: Full
Age range: Bajocian Age (JB) — Bajocian Age (JB)
Lithological Description: Grey rubbly limestones: in lower part (Witchellia Grit) yellowish, shelly, sandy, ooidal and ironshot with brachiopods and rare ammonites including Witchellia; in middle part (Bourguetia Beds) very shelly with bivalves and gastropods including Bourguetia saemanni (Oppel); in upper part (Phillipsiana Beds) hard, sandy and shelly with brachiopods, including 'Terebratula' phillipsiana (Walker).
Definition of Lower Boundary: Upward change, locally a hardground, from ooidal and peloidal limestone (Notgrove Member) into limestone of Witchellia Grit as described in lithology.
Definition of Upper Boundary: Disconformity/hardground: limestone as in lithology overlain by Salperton Limestone Formation.
Thickness: Type section very approximately 8.5m.
Geographical Limits: North Cotswolds: Cleeve Hill - Andoversford area, Gloucestershire (Barron, A J M, et al, 1997, fig.4).
Parent Unit: Aston Limestone Formation (ASLS)
Previous Name(s): Middle Ragstones (-3644)
Phillipsiana Beds, Bourguetia Beds And Witchellia Grit (-497)
Cleeve Hill Beds (-1792)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Cleeve Hill, Gloucestershire. Buckman, J, 1897; Richardson, L, 1929; Barron, A J M, 1999. 
Reference Section  Pot Quarry, Cleeve Common SSSI, Gloucestershire. Barron, A J M, 1999, Appendix 1, Locality E. For further reference sections see Barron, A J M, et al, 1997. 
Type Section  Rolling Bank Quarry, Cleeve Common SSSI, Gloucestershire. Wright, C W, 1860, pp.18-20; Buckman, J, 1897, 609-610, 619, beds II (1-5), III (1-5) and IV; Barron, A J M, 1999, Appendix 1, Locality A; Cox, B M, and Sumbler, M G. 2002. 
Reference(s):
Buckman, S S, 1905. A monograph of the ammonites of the Inferior Oolite Series, Pt.13, Supplement pp.clxix-ccix. 
Buckman, S S, 1895. The Bajocian of the mid-Cotswolds. Quarterly Journal of the Geological Society of London, Vol.51, 388-445; 458-462. 
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 Unpublished PhD thesis, University of Keele. 
Wright, T, 1860. On the subdivisions of the Inferior Oolite of the south of England, compared with the equivalent beds of that formation on the Yorkshire coast. Quarterly Journal of the Geological Society of London, 16, 1-48. 
Richardson, L. 1929. The Country around Moreton in Marsh. Memoir of the Geological Survey of Great Britain, Sheet 217 (England and Wales). 
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 Bishop's Cleeve area (1:10 000 Sheet SO92NE). British Geological Survey Technical Report WA/99/01. 
Buckman, S S, 1897. Deposits of the Bajocian age in the northern Cotswolds: the Cleeve Hill Plateau. Quarterly Journal of the Geological Society of London, Vol.53, 607-629. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E235 E217