| Computer Code: |
PLWF |
Preferred Map Code: |
PoF |
| Status Code: |
Pending Upgrade |
| Age range: |
Early Triassic Epoch (TE)
— Early Triassic Epoch (TE) |
| Lithological Description: |
[Obsolete: use CHES] 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) |
| 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. |
| Institute of Geological Sciences, 1980a. Institute of Geological Sciences Boreholes 1978. Report of the Institute of Geological Sciences, No.79/12, p.18. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E155
E141
|
