| Computer Code: |
PMV |
Preferred Map Code: |
PMV |
| Status Code: |
Pending Upgrade |
| Age range: |
Abereiddian Stage (O2)
— Abereiddian Stage (O2) |
| Lithological Description: |
Rhyolitic and dacitic lavas, tuffs and agglomerates, locally with interbedded sediments and debris flows. |
| Definition of Lower Boundary: |
Not defined. |
| Definition of Upper Boundary: |
Not defined. |
| Thickness: |
80-100 metres. |
| Geographical Limits: |
1:50,000 Sheet 209 (St.Davids) and adjacent Sheet 210. |
| Parent Unit: |
Fishguard Volcanic Group (FIV)
|
| Previous Name(s): |
Lower Rhyolitic Division [Obsolete Name and Code: Use PMV]
(-4841)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
| Thomas, G E and Thomas, T M. 1956. The volcanic rocks of the area between Fishguard and Strumble Head, Pembrokeshire. Quarterly Journal of the Geological Society, Vol.112, 291-314. |
| Bevins, R E, and Roach, R A. 1980. Early Ordovician Volcanism in Dyfed, south-west Wales. 603-609 in The Caledonides of the British Isles Reviewed. Harris, A L, Holland, C H, and Leake, B E (editors). Geological Society Special Publication, No. 8. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E209
|
