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:
Type Area  Outcrop of formation between villages of Polesworth and Warton. 
Reference Section  (Partial) Twycross Borehole (SK30NW/13); depth range: 264.4 to 500.3m. 
Reference(s):
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. 
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) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E141 E155