The BGS Lexicon of Named Rock Units — Result Details
Lower Lias Clay Formation [Obsolete: use CHAM]
| Computer Code: | LLIC | Preferred Map Code: | LLi |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Sinemurian Age (JS) — Pliensbachian Age (JE) | ||
| Lithological Description: | [Obsolete: use CHAM] Grey, blocky and fissile, fossiliferous mudstones with some thin limestones. | ||
| Definition of Lower Boundary: | Placed at base of mudstones where they overlie the topmost limestone bed of the Rugby Limestone Member of the Blue Lias Formation. | ||
| Definition of Upper Boundary: | Transitional, passing upwards into the Dyrham Siltstone Formation. | ||
| Thickness: | About 250m in Worcester Basin. | ||
| Geographical Limits: | Gloucestershire - Worcestershire. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Lower Lias Clay [Obsolete Name and Code: Use LLIC]
(-1661)
Lower Lias Clays [Obsolete Name and Code: Use LLIC] (-1031) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| none recorded or not applicable | |||
| Reference(s): | |||
| Worssam, B C, Ellison, R A and Moorlock, B S P. 1989. Geology of the country around Tewkesbury. Memoir of the British Geological Survey, Sheet 216 (England and Wales). | |||
| Cope, J C W and others, 1980. A correlation of Jurassic rocks in the British Isles. Part 1: Introduction and Lower Jurassic. Special Report of the Geological Society of London, No.14. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E216 E249 S013 | |||