The BGS Lexicon of Named Rock Units — Result Details

Pennard Sand Member [Obsolete Name And Code]

Computer Code: PENS Preferred Map Code: notEntered
Status Code: Index Level
Age range: Pliensbachian Age (JE) — Pliensbachian Age (JE)
Lithological Description: Fine-grained sandy clay, clayey fine-grained sand and thin beds of fine-grained sand.
Definition of Lower Boundary: Upward change from silty clays and silts (Ditcheat Clay) to fine-grained sandy clays and sands.
Definition of Upper Boundary: Upward change to fossiliferous limestone of the Marlstone Rock Bed.
Thickness: 25-40m
Geographical Limits: From Pennard Hill (limit of mapping in west) eastwards to Wyke Champflower - Milton Clevedon - Batcombe - north of Stoney Stratton.
Parent Unit: Middle Lias (Undifferentiated) [Obsolete Name And Code] (MLI)
Previous Name(s): Pennard Sands [Obsolete Name And Code: See PENS] (PNS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Pennard Hill, Somerset. 
Reference(s):
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. 
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