| Computer Code: |
PVP |
Preferred Map Code: |
notEntered |
| Status Code: |
Full, pending ratification |
| Age range: |
Proterozoic Eon (AP)
— Proterozoic Eon (AP) |
| Lithological Description: |
Red and green trachytic and andesitic tuffs as well as halleflinta and porcellanites. Feldspathic grit with fragments of felsite and vesicular andesites. |
| Definition of Lower Boundary: |
Drawn at base of halleflinta of Penrhiw Group. (Base not seen). (Penrhiw Group = part of Pebidian Complex). |
| Definition of Upper Boundary: |
Drawn at conformable upward passage from feldspathic grit of the Penrhiw Group to green grit with trachyte fragments of the Treginnis Group. |
| Thickness: |
At least 310 metres. |
| Geographical Limits: |
South-west Wales. |
| Parent Unit: |
Pebidian Supergroup (PN)
|
| Previous Name(s): |
Penrhiw Series [Obsolete Name and Code: Use PVP]
(-4276)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Penrhiw Vicarage, St Davids, Dyfed, Wales. |
| Reference(s): |
| Cox, A H, Green, J F N, Jones, O T, and Pringle, J. 1930. The Geology of the St David's district, Pembrokeshire. Proceedings of the Geologists' Association, Vol.41, 241-273. |
| Harris, A L and others, 1973. A correlation of the Pre-Cambrian rocks in the British Isles. Geological Society of London Special Report No 6. |
| Pringle, J and George, T N, 1948. South Wales. British Regional Geology. |
| Green, J F N. 1908. The geological structure of the Saint David's area (Pembrokeshire). Quarterly Journal of the Geological Society of London, Vol.64, 363-383. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
