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 (-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):
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E327