The BGS Lexicon of Named Rock Units — Result Details

Craighead Volcanic Formation

Computer Code: CRV Preferred Map Code: CRV
Status Code: Full
Age range: Abereiddian Stage (O2) — Caradoc Series (O4)
Lithological Description: Basaltic pillow lava, with associated bedded chert.
Definition of Lower Boundary: Lower boundary not seen.
Definition of Upper Boundary: Unconformably overlain by the Craighead Limestone Formation.
Thickness: At least 500 m thick.
Geographical Limits: Craighead Inlier, Girvan.
Parent Unit: Not Applicable (-)
Previous Name(s): Arenig Ballantrae Volcanic Complex (Assumed To Be Part Of) (-2124)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  The northern, western and eastern slopes of Craighead Hill, Girvan. 
Reference(s):
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. 
Lamont, A, and Lindstrom, M, 1957. Arenigian and Llandeilian cherts identified in the Southern Uplands by means of conodonts, etc., Transactions of the Edinburgh Geological Society, Vol. 17, 60-70. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S014 S008