The BGS Lexicon of Named Rock Units — Result Details

Ramsey Sound Group

Computer Code: PVR Preferred Map Code: PVR
Status Code: Pending Upgrade
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 (-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):
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.] 
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 amd Horak, J. 2000. St David's Peninsula. 131-136 in Carney, J (Editor), Precambrian Rocks of England and Wales. 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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E209