The BGS Lexicon of Named Rock Units — Result Details
Pylle Clay Member
| Computer Code: | PYC | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Sinemurian Age (JS) — Pliensbachian Age (JE) | ||
| Lithological Description: | Dark grey shaly mudstone. | ||
| Definition of Lower Boundary: | Upward change from alternating thin limestones and mudstones, to a thick mudstone sequence. | ||
| Definition of Upper Boundary: | Upward change to micritic limestones, or, where absent, to silty and fine-grained sandy clay. | ||
| Thickness: | To 20m | ||
| Geographical Limits: | From at least as far west as Pylle (limit of current mapping on 1:50k sheets 296 and 297)in an arc southeastward to just west of Milton Clevedon [ST 655 370] | ||
| Parent Unit: | Charmouth Mudstone Formation (CHAM) | ||
| Previous Name(s): | Lower Lias Marls [Obsolete Name and Code: Use PYC]
(-473)
Lower Lias Shales [Obsolete Name and Code: Use PYC] (-3628) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Around the hamlet of Pylle, Somerset | ||
| Reference(s): | |||
| Hollingworth N T J, Ward D J, Simms, M J and Clothier, P, 1990. A temporary exposure of Lower Lias (Late Sinemurian) at Dimmer Camp, Castle Cary, Somerset, south-west England Mesozoic research, Vol.2, 163-180 | |||
| Donovan, D T, Bennett, R, Bristow, C R, Carpenter, S C, Green, G W, Hawkes, C J, Prudden, H C and Stanton W I. 1989. Geology of a gas pipeline from Ilchester (Somerset) to Pucklechurch (Avon), 1985. Proceedings of the Somerset Archaeological and Natural History Society for 1988, Vol.132, 297-317. | |||
| Kellaway, G A and Wilson, V. 1941. An outline of the geology of Yeovil, Sherborne and Sparkford Vale. Proceedings of the Geologists' Association, Vol.52, 131-174. | |||
| Duff K L, McKirdy A P and Harley M J [Eds], 1985. New Sites for Old. A Student's Guide to the Geology of the East Mendips. Nature Conservancy Council. | |||
| Bristow, C R, and Westhead R K. 1993. Geology of the Evercreech-Batcombe area (Somerset). British Geological Survey Technical Report WA/93/89. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||