The BGS Lexicon of Named Rock Units — Result Details

Tisbury Member

Computer Code: TIY Preferred Map Code: Tiy
Status Code: Full
Age range: Tithonian Age (JI) — Tithonian Age (JI)
Lithological Description: Fine-grained, glauconitic, bioclastic sandstones and limestones.
Definition of Lower Boundary: Upward change from clayey sands and sandy clays of the Wardour Formation to bioclastic calcareous sandstone and sandy limestone.
Definition of Upper Boundary: Upward change from glauconitic calcareous sandstones and sandy limestones to non-glauconitic micrites of the Wockley Member.
Thickness: 12-15m
Geographical Limits: West Tisbury [ST 910 290] to Chilmark [ST 975 310]
Parent Unit: Portland Stone Formation (POST)
Previous Name(s): Chicksgrove Limestone Member (-570)
Tisbury Freestone And Ragstone (-1234)
Chicksgrove Member (-1863)
Tisbury Glauconitic Member (-4371)
Lower Building Stones And Ragstone (-4928)
Ragstones (-4929)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Tisbury Quarry, Tuckingmill 
Partial Type Section  Chicksgrove Quarry, Upper Chicksgrove Working Quarry, south side of river. 
Partial Type Section  Tisbury Borehole (BGS) ST 92 NW/2 (Depth 0-9.88m) 
Reference(s):
Reid C. 1903, Geology of the country around Salisbury. Memoir of the Geol. Survey of Great Britain. 
Woodward, H B. 1895. the Jurassic Rocks of Britain. The Middle and Upper Oolitic rocks of England (Yorkshire excepted). Vol.5. Memoir or the Geological Survey of the United Kingdom. 
Wimbledon, W A. 1976. The Portland Beds (Upper Jurassic) of Wiltshire. Wiltshire Archaeological and Natural History Magazine, Natural History, Vol.71, 3-11. 
Wimbledon, W A. 1980. Portlandian correlation chart. 85-93 in Cope, J C W (Editor), A correlation of the Jurassic rocks of the British Isles. Part Two: Middle and Upper Jurassic. Geological Society of London Special Report, No.15. 
Hudleston W H, 1883 (for 1881). On the geology of the Vale of Wardour. Proceedings of the Geologists' Association. Vol.7, 161-185. 
Blake, J F. 1880. On the Portland Rocks of England. Quarterly Journal of the Geological Society of London, Vol.36, 189-236. 
Wimbledon, W A and Cope, J C W. 1978. The ammonite faunas of the English Portland Beds and the zones of the Portlandian Stage. Journal of the Geological Society of London, Vol.135, 183-190. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable