The BGS Lexicon of Named Rock Units — Result Details

Ditcheat Clay Member

Computer Code: DICL Preferred Map Code: notEntered
Status Code: Full
Age range: Pliensbachian Age (JE) — Pliensbachian Age (JE)
Lithological Description: Silty clays and silts
Definition of Lower Boundary: Upward change from dominantly limestone succession of Spargrove Limestone or, where absent, from the dark grey mudstones of the Pylle Clay.
Definition of Upper Boundary: Somewhat transitional, but marked by upward passage into fine-grained sandy clays of the Pennard Sand Member.
Thickness: 40-60m
Geographical Limits: From Wraxhall [ST 600 365] in west (limit of current mapping) in an arc north-eastwards through Milton Clevedon to north of Stoney Stratton.
Parent Unit: Charmouth Mudstone Formation (CHAM)
Previous Name(s): Belemnitiferous And Micaceous Marls (Upper Part) (-3993)
Lower Lias Marls (Upper Part) (-3994)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Around the village of Ditcheat, Somerset 
Reference(s):
Wilson, V, Welch, F B A, Robbie, J A, and Green, G W. 1958. Geology of the country around Bridport and Yeovil. Memoir of the Geological Survey of Great Britain, Sheets 327 and 312 (England and Wales). 
Bristow, C R and Westhead R K, 1993. Geology of the Evercreech-Batcombe area (Somerset). British Geological Survey Technical Report WA/93/89. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable