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
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) 
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. 
Reid C. 1903, Geology of the country around Salisbury. Memoir of the Geol. Survey of Great Britain. 
Blake, J F. 1880. On the Portland Rocks of England. Quarterly Journal of the Geological Society of London, Vol.36, 189-236. 
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. 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. 
Wimbledon, W A. 1976. The Portland Beds (Upper Jurassic) of Wiltshire. Wiltshire Archaeological and Natural History Magazine, Natural History, Vol.71, 3-11. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable