| Computer Code: |
PVR |
Preferred Map Code: |
PVR |
| Status Code: |
Full |
| Age range: |
Ediacaran Period (AD)
— Ediacaran Period (AD) |
| Lithological Description: |
Fine- to coarse-grained silicic ash-flow tuffs, locally welded, including soft chloritic and sericitic fine-grained tuffs with some porcellanitic tuffs. |
| Definition of Lower Boundary: |
Appears to overlie the feldspathic tuffs and tuffaceous conglomerates of the Caerbwdy Group conformably. |
| Definition of Upper Boundary: |
Appears to be overlain conformably by the andesitic and basaltic tuffs and lavas of the Rhosson Group. |
| Thickness: |
At least 200m |
| Geographical Limits: |
Pembrokeshire: 1:50 000 Sheet 209 (St Davids) extending onto Sheet 210 (Fishguard). |
| Parent Unit: |
Pebidian Supergroup (PN)
|
| Previous Name(s): |
Ramsey Sound Series [Obsolete Name and Code: Use PVR]
(-4277)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Porthlysgi Bay, 2.7km southwest of St David's, Pembrokeshire. Bevins, R E and Horak, J. 2000. |
| Partial Type Section |
Carn ar Wig, 3.6km westsouthwest of St David's, Pembrokeshire. Bevins, R E and Horak, J. 2000. |
| Reference(s): |
| Harris, A L, 1975. A Correlation of Pre-Cambrian Rocks in the British Isles. Geological Society of London Special Report, No.6. |
| Bevins, R E, and Horak, J. 2000. St David's Peninsula. 131-136 in Precambrian Rocks of England and Wales. Carney, J (editor). Geological Conservation Review Series, 20. (Peterborough: Joint Nature Conservation Committee.) |
| Cox, A H, Green, J F N, Jones, O T, and Pringle, J. 1930. The St David's District: Report of the summer meeting 1930. Proceedings of the Geologists' Association, Vol. 41, 412-438. |
| 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. |
| Earp, J R. 1973. St David's Solid. 1:25 000, Geological Special Sheet, England and Wales. (London: Institute of Geological Sciences.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E209
|
