| Computer Code: |
CPB |
Preferred Map Code: |
CPB |
| Status Code: |
Pending Upgrade |
| Age range: |
Early Triassic Epoch (TE)
— Early Triassic Epoch (TE) |
| Lithological Description: |
[Obsolete: use CHES] Sandstone, fine- to coarse-grained, commonly pebbly, with conglomerates and sporadic siltstones; cross-stratified. |
| Definition of Lower Boundary: |
Drawn at base of sequence dominated by sandstones containing pebbles and conglomerates; pebbles do not have a local derivation. Conformable on the Kinnerton Formation or unconformable on Palaeozoic rocks. |
| Definition of Upper Boundary: |
Transition at base of Wilmslow Sandstone Formation. |
| Thickness: |
<90m - >220m |
| Geographical Limits: |
Cheshire Basin. |
| 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 |
Collinge Wood Quarry (500m east of Backford Bridge where the A41 crosses the canal). |
| Reference Section |
Railway cutting (North Wales Line). Northgate Street traffic interchange to Northgate Stadium. |
| Type Area |
Town of Chester and vicinity (sites in Earp, and Taylor, 1986). |
| Reference(s): |
| 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. |
| Earp, J R and Taylor, B J, 1986. Geology of the country around Chester and Winsford. Memoir of the British Geological Survey, Sheet 109 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E123
E121
E109
E151
E137
E096
|
