The BGS Lexicon of Named Rock Units — Result Details
Down Cliff Sand Member
| Computer Code: | DCSA | Preferred Map Code: | DCS |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Pliensbachian Age (JE) — Pliensbachian Age (JE) | ||
| Lithological Description: | Grey-brown, muddy, very fine-grained sands and sandy mudstones, closely interbedded. | ||
| Definition of Lower Boundary: | Base of Starfish Bed. | ||
| Definition of Upper Boundary: | Top of Margaritatus Stone. | ||
| Thickness: | To 27m | ||
| Geographical Limits: | Southwest Dorset. Mapped on Sheet 327 (Bridport). Northern limit not yet proved. | ||
| Parent Unit: | Dyrham Formation (DYS) | ||
| Previous Name(s): | Down Cliff Sands [Obsolete Name and Code: Use DCSA]
(-2147)
Laminated Beds (-855) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Sea cliffs , especially Ridge Cliff, between Seatown and Eype Mouth, Dorset. Howarth, M K, 1957. | ||
| Reference(s): | |||
| Howarth, M K, 1957. The Middle Lias of the Dorset coast. Quarterly Journal of the Geological Society of London, Vol.113, 185-204. | |||
| Day, E C H, 1863. On the Middle and Upper Lias of the Dorsetshire Coast. Quarterly Journal of the Geological Society of London, Vol.19, 278-297. | |||
| Woodward, H B, 1893. The Jurassic rocks of Britain. 3. The Lias of England and Wales (Yorkshire excepted). Memoir of the Geological Survey of Great Britain. | |||
| Arkell, W J. 1933. The Jurassic System in Great Britain (Oxford: Clarendon Press.) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E327 | |||