The BGS Lexicon of Named Rock Units — Result Details

Rhosson Group

Computer Code: PVH Preferred Map Code: PVH
Status Code: Pending Upgrade
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Andesitic, trachytic and basaltic autobrecciated lavas and scoriaceous debris.
Definition of Lower Boundary: Appears to overlie the Ramsey Sound Group conformably.
Definition of Upper Boundary: Appears to be overlain conformably by the Ogofgolchfa Group.
Thickness: At least 550m
Geographical Limits: Pembrokeshire: 1:50 000 Sheet 209. (St Davids).
Parent Unit: Pebidian Supergroup (PN)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Reference Section  Carn Rhosson, 2.4km west of St David's, Pembrokeshire. Bevins, R E and Horak, J. 2000. 
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.] 
Davies, E C and Bloxam, T W. 1990. Petrology and geochemistry of late Precambrian volcanic rocks of the St David's area, Pembrokeshire, South Wales (UK). Geologie en Miijnbouw, Vol.69, 407-416. 
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: