The BGS Lexicon of Named Rock Units — Result Details

Pebidian Supergroup

Computer Code: PN Preferred Map Code: PV
Status Code: Pending Upgrade
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Trachytic and andesitic tuffs, with locally conglomeratic tuffaceous sediments. NOTE: The definition follows the usage on British Geological Survey 1:25 000 Special Sheet SM72 (St Davids), 1973, which in turn derives from Green, JFN. 1908.The computer code PV already exists for 'Pebidian Volcanic Series (undifferentieated)'.
Definition of Lower Boundary: Base not seen.
Definition of Upper Boundary: Stratigraphical top uncertain/undefined (see Ogofgolchfa Group); ?overlain unconformably by Lower Palaeozoic rocks.
Thickness: At least 2000m.
Geographical Limits: St. Davids Sheet 209.
Parent Unit: Not Applicable (-)
Previous Name(s): Pebidian Volcanic Series (-1123)
Pebidian Volcanic "Series", Undivided [Obsolete Name And Code: Use PN] (PV)
Pebidian Supergroup [Obsolete Code: Use PN] (PVL)
Lower Pebidian (Undifferentiated) (-460)
Pebidian Volcanic Complex (Undifferentiated) (-461)
Pebidian Volcanic Complex (-2978)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Pharaoh T C and Gibbons W. 1994. Precambrian rocks in England and Wales south of the Menai Strait Fault System. 85-97 in Gibbons W and Harris A L (editors), A revised correlation of Precambrian rocks in the British Isles. Geological Society of London Special Report No.22. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E210 E209