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 [Obsolete Name and Code: Use STP]
(-4349)
Pisolitic Beds [Obsolete Name and Code: Use STP] (-3058) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| 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. | ||
| Reference(s): | |||
| Bristow, C R. 1990. Geology of the West Stour - Cucklington district. British Geological Survey Technical Report WA/90/48. | |||
| 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. | |||
| Wright, J K, 1981. The Corallian rocks of north Dorset. Proceedings of the Geologists' Association, Vol.92, 17-32. | |||
| Freshney, E C. 1989. Geology of Sheets ST70NW and ST70NE. (Hazelbury Bryan-Mappowder district, Dorset). British Geological Survey Technical Report WA/90/51. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E297 E313 | |||