The BGS Lexicon of Named Rock Units — Result Details

Cucklington Oolite Member

Computer Code: CUO Preferred Map Code: CkO
Status Code: Full
Age range: Oxfordian Age (JO) — Oxfordian Age (JO)
Lithological Description: Shelly, locally sandy, oosparite; lower beds commonly micritic, with interbeds of oolitic marl.
Definition of Lower Boundary: Fairly abrupt change from oolitic, grey clay, to shelly limestones.
Definition of Upper Boundary: Fairly abrupt change from limestone to mudstone, locally oolitic, of the Hinton St. Mary Clay. Where the Hinton St. Mary Clay is absent, the limestones pass up fairly abruptly into the Sturminster Pisolite.
Thickness: 2 - 5m (2.73m in the type quarry; 3.86m in the East Stour Borehole - ST82SW/9).
Geographical Limits: Most of the way across the Shaftesbury Sheet (313) and across the southern part of the Wincanton Sheet (297).
Parent Unit: Stour Formation (STOU)
Previous Name(s): Limestones Of Langham And Cucklington (-176)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Old quarry, Cucklington village. (Based on a section in Blake and Hudleston, 1877). 
Partial Type Section  Stoke Trister Quarry. Wright, 1981, p.19. 
Reference Section  East Stour Borehole (ST82SW/9) from 21.64m - 25.5m depth. 
Reference(s):
Bristow, C R, 1989. Geology of the East Stour - Shaftesbury district (Dorset) British Geological Survey Technical Report WA/89/58. 
Wright, J K, 1981. The Corallian rocks of north Dorset. Proceedings of the Geologists' Association, Vol.92, 17-32. 
Wright, J K, 1980. Oxfordian Correlation Chart. "In" Cope, C J W, (Editor). A correlation of Jurassic rocks in the British Isles, Part two: Middle and Upper Jurassic. Geological Society of London Special Report No.15. (p.61-76 in Correlation Chart). 
Blake, J F and Huddleston, W H 1877. On the Corallian rocks of England. Quarterly Journal of the Geological Society of London, Vol.33, 260-405. 
Bristow, C R, 1990. Geology of the West Stour - Cucklington district. British Geological Survey Technical Report WA/90/48. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E297 E313 E281