The BGS Lexicon of Named Rock Units — Result Details
Chilmark Member
Computer Code: | CHK | Preferred Map Code: | Chk |
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Status Code: | Full | ||
Age range: | Tithonian Age (JI) — Tithonian Age (JI) | ||
Lithological Description: | Fine-grained oolitic limestone. | ||
Definition of Lower Boundary: | Incoming of significant ooliths above sequence of micrites of the Wockley Member. | ||
Definition of Upper Boundary: | Base of "Dirt Bed" at base of Purbeck Formation. | ||
Thickness: | 0-6m. | ||
Geographical Limits: | On north side of river Nadder between Fonthill Bishop and Chilmark; south of River Nadder between Wockley [ST 9555 2870] and Chicksgrove [ST 964 296] quarries. | ||
Parent Unit: | Portland Stone Formation (POST) | ||
Previous Name(s): | Chilmark Oolite Member [Obsolete Name and Code: Use CHK]
(-2082)
Upper Building Stones [Obsolete Name and Code: Use CHK] (-1427) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Upper Quarry (Teffont Evias Parish), RAF Chilmark | ||
Reference(s): | |||
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. | |||
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. | |||
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 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. | |||
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. 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: | |||
E297 |