The BGS Lexicon of Named Rock Units — Result Details

Sturminster Pisolite Member

Computer Code: STP Preferred Map Code: StP
Status Code: Full
Age range: Oxfordian Age (JO) — Oxfordian Age (JO)
Lithological Description: Pisoliths or oncoliths, about 6mm diameter, varying from spherical to oblate, in a coarse-grained oolitic matrix; locally the matrix is an oolitic clay. In places the pisoliths/oncoliths form a grain-supported concentrate.
Definition of Lower Boundary: Usually sharply defined by an abrupt incoming of large numbers of pisoliths/oncoliths.
Definition of Upper Boundary: Usually sharply defined by the abrupt disappearance of pisoliths/oncoliths.
Thickness: 0.1 - 2m
Geographical Limits: Across the Shaftesbury Sheet (313) and southern part of Wincanton Sheet (297).
Parent Unit: Stour Formation (STOU)
Previous Name(s): Pisolite Facies (-4349)
Pisolitic Beds (-3058)
Alternative Name(s): none recorded or not applicable
Reference Section  East Stour Borehole (ST82SW/9) from 21.64m to 24.19 depth. 
Type Section  Road section on the south side of the A357, 170m at 250 degrees from Newton Bridge. 
Gutmann, K, 1970. The Corallian Beds at Todber and White Way Hill in north Dorset. Proceedings of Dorset Natural History and Archaeological Society, Vol.91, p.123-133. 
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). 
Bristow, C R, 1989. Geology of Sheets 71NE and 71SE. (Marnhull-Sturminster Newton, Dorset) Part of 1:10,000 Sheet 313 (Shaftesbury). British Geological Survey Technical Report WA/89/59. 
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. 
Freshney, E C. 1989. Geology of Sheets ST70NW and ST70NE. (Hazelbury Bryan-Mappowder district, Dorset). British Geological Survey Technical Report WA/90/51. 
Wright, J K, 1981. The Corallian rocks of north Dorset. Proceedings of the Geologists' Association, Vol.92, 17-32. 
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