The BGS Lexicon of Named Rock Units — Result Details
Fishguard Volcanic Group
| Computer Code: | FIV | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Abereiddian Stage (O2) — Abereiddian Stage (O2) | ||
| Lithological Description: | Rhyolitic and dacitic lavas, basaltic pillow lavas. Spilitic breccias, acid tuffs and intercalated volcaniclastic sediments. Correlative of Fishguard Volcanic Group-Llanrian Volcanic Group. | ||
| Definition of Lower Boundary: | Drawn at base of rhyolitic and dacitic lavas of the Porth Maen Melyn Volcanic Formation where it rests conformably on dark mudstones of the Aber Mawr Shale Formation. | ||
| Definition of Upper Boundary: | Drawn at conformable upward passage from rhyolitic lavas of the Goodwick Volcanic Formation to dark grey mudstones of the Caerhys Shale. | ||
| Thickness: | Approx. 1800 metres. | ||
| Geographical Limits: | South-west Wales. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Fishguard Volcanic Complex [Obsolete Name and Code: Use FIV]
(-252)
Fishguard Volcanic Series (-910) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Fishguard area, Dyfed, Wales. | ||
| Reference(s): | |||
| Bevins, R E, and others. 1989. Ordovician intrusions of the Strumble Head-Mynydd Preseli region, Wales: lateral extensions of the Fishguard Volcanic Complex. | |||
| 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. | |||
| Evans, W D. 1945. The geology of the Preselly Hills, north Pembrokeshire. Quarterly Journal of the Geological Society, Vol. 101, 95. | |||
| Bevins, R E. 1982. Petrology and geochemistry of the Fishguard Volcanic Complex, Wales. Geological Journal, Vol.17 (1), 1-21. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E210 | |||