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): LOWER PEBIDIAN (UNDIFFERENTIATED) (PVL)
PEBIDIAN VOLCANIC COMPLEX (UNDIFFERENTIATED) (PVL)
PEBIDIAN VOLCANIC SERIES (PV)
PEBIDIAN VOLCANIC COMPLEX (PVL)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Pharaoh and Gibbons, W, 1994. A revised correlation of Precambrian rocks in the British Isles, Gibbons, W, Harris, A L (editors). Geological Society of London Special Report, No. 22. 
Green, J F N, 1908. The geological structure of the St Davids area (Pembrokeshire). Quarterly Journal of the Geological Society, Vol.64, p. 363. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E210 E209