| Computer Code: |
UMG |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pragian Age (DP)
— Pragian Age (DP) |
| Lithological Description: |
[Obsolete; use FWW] Red, locally nodular, mudstones, fine- to very fine-grained sandstones and intraformational conglomerates: lithology represents fining up sequences (cyclothems). |
| Definition of Lower Boundary: |
Drawn at the base of the Upper Marl Group where it rests conformably on the Sandstone and Marl Group. |
| Definition of Upper Boundary: |
Drawn at the conformable upward passage from the top of the upper marl group to the base of the green flaggy sandstones formation of the Casheston Group. |
| Thickness: |
106 metres to 305 metres approx. |
| Geographical Limits: |
South Pembrokeshire (Dyfed), southwest Wales. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Pembrokeshire. Between Milford Haven and the Pembrokeshire Coalfield. |
| Reference(s): |
| Strahan A, Cantrill T C, Dixon E E L, Thomas H H, and Jones O T. 1914. The geology of the South Wales Coalfield, Part XI. The country around Haverfordwest. Memoir of the Geological Survey of Great Britain. (London: HMSO). 262pp. |
| Allen, J R L. 1963. Depositional features of Dittonian Rocks. Pembrokeshire compared with the Welsh Borderland. Geological Magazine, Vol. 100, 385-400. |
| Dixon, E E L. 1921. The Geology of the South Wales Coalfield, Part XIII , the country around Pembroke and Tenby, being an account of the region comprised in sheets 244 and 245. Memoir of the Geological Survey of Great Britain (HMSO). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E080
E089
|
