The BGS Lexicon of Named Rock Units — Result Details
Great Oolite Group
| Computer Code: | GOG | Preferred Map Code: | GtO |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Bajocian Age (JB) — Callovian Age (JC) | ||
| Lithological Description: | Variety of mudstone-dominated and ooidal, bioclastic and fine-grained limestone formations. | ||
| Definition of Lower Boundary: | Change up from ooidal and/or pisoidal limestone (Salperton Limestone Formation/Lincolnshire Limestone Formation) or ironstone or ferruginous sandstone (Northampton Sand Formation), all of Inferior Oolite Group; overlain by silicate/calcareous mudstone (Fuller’s Earth Formation) or pale sandstone (Horsehay Sand Formation/Stamford Member of Rutland Formation) or sandy, fine-grained ooid limestone (Chipping Norton Limestone Formation). Generally a non-sequence or disconformity. | ||
| Definition of Upper Boundary: | Base of succeeding Kellaways Formation; comprising mudstone, commonly shelly at base, resting generally sharply and conformably or non-sequentially on bioclastic limestone of the Cornbrash. | ||
| Thickness: | About 20 m through Lincolnshire and the Midlands (East Midlands Shelf), thickening south through the Cotswolds (60 to 90 m) to 100 to 200 m in Somerset and Dorset, and in the Weald subcrop (Green, 1992; Sumbler, 1996). Offshore English Channel up to 224 m (Hamblin et al., 1992). | ||
| Geographical Limits: | Dorset, Somerset, through the south-west Midlands, Oxon, Northants, part of Lincolnshire and northwards as far as the Market Weighton High (covering areas formerly including the outcrop of the now obsolete "Redbourne Group"): Also proved in borings in the Weald (Wyatt, 2011), the London area and Norfolk. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Great Oolite [Obsolete Name and Code: Use CFDO, GOG]
(-4534)
Great Oolite Formation [Obsolete: See CFDO] (GOF) Great Oolite Series (-5115) Redbourne Group (RDBN) Great Oolite Limestone [Obsolete Name And Code: Use BWL, GOG or CFDO] (GOL) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Bath area [ST 75 60]. | ||
| Reference(s): | |||
| Torrens, H S, 1967. The Great Oolite Limestone of the Midlands. Transactions of the Leicestershire Literary and Philosophical Society, Vol.61, 65-90. | |||
| Sumbler, M G, 1996. British regional geology; London and the Thames Valley. (4th edition). (London: HMSO for the British Geological Survey). | |||
| Townsend, J. 1813. The character of Moses established for veracity as a historian, recording events from the creation to the deluge. (Bath: Gye; London: Longman.) | |||
| Green, G W and Donovan, D T. 1969. The Great Oolite of the Bath area. Bulletin of the Geological Survey of Great Britain, Vol.30, 1-63. | |||
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. | |||
| Judd, J W. 1875. The geology of Rutland and parts of Lincoln, Leicester, Northampton, Huntingdon and Cambridge. Memoir of the Geological Survey of Great Britain (Old Series sheet 64). | |||
| Cope, J C W. 2006. Jurassic: the returning seas. The geology of England and Wales. Brenchley, P J, and Rawson, P F (editors). (London: Geological Society.) | |||
| Green, G W. 1992. Bristol and Gloucester region (3rd). British Regional Geology. (London: HMSO for British Geological Survey.) | |||
| Wyatt, R J. 2011. A gamma-ray correlation of boreholes and oil wells in the Bathonian Stage succession (Middle Jurassic) of the Wealden Shelf subcrop. British Geological Survey Open Report, OR/11/048. | |||
| Barron, A J M, Lott, G K, and Riding, J B. 2012. Stratigraphical framework for the Middle Jurassic strata of Great Britain and the adjoining continental shelf. British Geological Survey Research Report RR/11/06. | |||
| Warner, R. 1811. A new guide through Bath and its environs. (Bath.) | |||
| Hamblin, R J O, Crosby, A, Balson, P S, Jones, S M, Chadwick, R A, Penn, I E, and Arthur, M J. 1992. The geology of the English Channel. British Geological Survey United Kingdom Offshore Regional Report. | |||
| Arkell, W J, and Donovan, D T. 1952. The Fuller's Earth of the Cotswolds and its relation to the Great Oolite. Quarterly Journal of the Geological Society of London, Vol. 107, 227-253. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E127 E144 E157 E159 E170 E171 E172 E185 E186 E187 E201 E202 E203 E217 E218 E219 E235 E236 E237 E251 E252 E253 E265 E268 E273 E281 E341 E342 E343 E081 | |||