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 Member [Obsolete Name and Code: Use TIY]
(-1863)
Chicksgrove Limestone Member (-570) Tisbury Freestone and Ragstone [Obsolete Name and Code: Use TIY] (-1234) Lower Building Stones and Ragstone [Obsolete Name and Code: Use TIY] (-4928) Ragstones [Obsolete Name and Code: Use TIY] (-4929) Tisbury Glauconitic Member [Obsolete Name and Code: Use TIY] (-4371) |
||
| 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): | |||
| 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. | |||
| Reid C. 1903, Geology of the country around Salisbury. Memoir of the Geol. Survey of Great Britain. | |||
| 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. | |||
| 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 | |||