| Computer Code: |
PFLD |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Hirnantian Age (OH)
— Hirnantian Age (OH) |
| Lithological Description: |
Interbedded dark grey carbonaceous mudstones [Cuckoo Shale Member; Scotchwell Shale Member] and well-sorted, fine-grained, grey and buff sandstones [Cethings Sandstone Member]. Local conglomerates at, or near, the base of the Formation. |
| Definition of Lower Boundary: |
Apparently conformable on the underlying Slade and Redhill Formation, but contact nowhere seen. |
| Definition of Upper Boundary: |
Conformably and gradationally overlain by the Haverford Mudstone Formation. |
| Thickness: |
At least 65m |
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Not Available (!)
|
| Previous Name(s): |
Basement Beds [Obsolete Name and Code: Use WAR, HEY, BRCT, BABE, LFSB, LLW, DELA, FRM, PLT, FRFA, PFLD, DDC]
(-3812)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Cocks, L R M and Price, D. 1975. The biostratigraphy of the Upper Ordovician and Lower Silurian of south-west Dyfed, with comments on the Hirnantia fauna. Palaeontology, Vol.18, 703-724. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
