The BGS Lexicon of Named Rock Units — Result Details

Polesworth Formation [Obsolete Name And Code Use: CHES]

Computer Code: PLWF Preferred Map Code: PoF
Status Code: Pending Upgrade
Age range: Early Triassic Epoch (TE) — Early Triassic Epoch (TE)
Lithological Description: Poorly cemented, reddish-brown sandstone with thin beds of red mudstone and conglomerate.
Definition of Lower Boundary: Taken at the contact with the underlying, crudely-bedded mudstones and breccias of the Hopwas and Moira Breccias.
Definition of Upper Boundary: Taken at the junction between the conglomerate dominated Polesworth Formation and the sandstone and mudstone dominated Bromsgrove Formation.
Thickness: 140-200m near type area; may exceed 200m in deepest parts of Hinckley Basin.
Geographical Limits: Mapped at surface, and proven by borings in the Hinckley Basin. (East Warwickshire/west Leicestershire).
Parent Unit: none recorded or not applicable
Previous Name(s): Bunter Pebble Beds [Obsolete Name And Code: Use CHES] (BNP)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  (Partial) Twycross Borehole (SK30NW/13); depth range: 264.4 to 500.3m. 
Type Area  Outcrop of formation between villages of Polesworth and Warton. 
Reference(s):
Worssam, B C and Old, R A, 1988. Geology of the country around Coalville. Memoir of the British Geological Survey, Sheet 155 (England and Wales) 
Institute of Geological Sciences, 1980a. Institute of Geological Sciences Boreholes 1978. Report of the Institute of Geological Sciences, No.79/12, p.18. 
Warrington, G, Audley-Charles, M G, Elliott, R E, Evans, W B, Ivimey-Cook, H C, Kent, P E, Robinson, P L, Shotton, F W and Taylor, F M. 1980. A correlation of the Triassic rocks in the British Isles. Special Report of the Geological Society of London, No.13. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155 E141