The BGS Lexicon of Named Rock Units — Result Details

Blackcraig Formation

Computer Code: BLKC Preferred Map Code: BLKC
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Massive wacke and conglomerate.
Definition of Lower Boundary: Interfingers with the Kirkcolm Formation.
Definition of Upper Boundary: Interfingers with the Kirkcolm Formation.
Thickness: c.1500m
Geographical Limits: Southern Uplands of south Scotland.
Parent Unit: Barrhill Group (BRHL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Afton Water, downstream from Afton Dam. 
Reference(s):
Floyd, J D, 1982. Stratigraphy of a flysch succession: The Ordovician of West Nithsdale, South West Scotland. Transactions of the Royal Society of Edinburgh, Earth Sciences, Vol.73 (1), p.1-9. 
Floyd, J D, 1996. Lithostratigraphy of the Ordovician rocks in the Southern Uplands: Crawford Group, Moffat Shale Group, Leadhills Supergroup. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.86, 153-165. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S015 S008