The BGS Lexicon of Named Rock Units — Result Details

Goodwick Volcanic Formation

Computer Code: GDV Preferred Map Code: GdV
Status Code: Full
Age range: Abereiddian Stage (O2) — Abereiddian Stage (O2)
Lithological Description: Rhyolite lavas and rhyolitic tuffs.
Definition of Lower Boundary: Drawn at base of rhyolitic lavas and tuffs of the Goodwick Volcanic Formation where it rests conformably on pillow lavas of the Strumble Head Volcanic Formation.
Definition of Upper Boundary: Drawn at conformable upward passage from rhyolitic lavas and tuffs of the Goodwick Volcanic Formation to calcareous flags.
Thickness: Up to 160 metres.
Geographical Limits: 1:50,000 Sheet 209 (St.David's) and adjacent Sheet 210.
Parent Unit: Fishguard Volcanic Group (FIV)
Previous Name(s): Upper Rhyolite Division (-2201)
Alternative Name(s): none recorded or not applicable
Type Area  North of Goodwick, near Fishguard, Dyfed, Wales. 
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. "In" Harris, A Land others. The Caledonides of the British Isles Reviewed. Geological Society Special Publication, No.8, p.603-609. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: