The BGS Lexicon of Named Rock Units — Result Details

Afton Formation [Obsolete Name And Code: Use KKF]

Computer Code: AFTN Preferred Map Code: AFTN
Status Code: Index Level
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Thin-bedded, medium- to fine-grained greywackes and grey shales; greywackes rich in quartz, poor in ferromagnesian minerals.
Definition of Lower Boundary: Rests on Moffat Shales but is probably diachronous.
Definition of Upper Boundary: Overlain by Blackcraig Formation.
Thickness: > 2000 metres.
Geographical Limits: Not defined.
Parent Unit: Leadhills Supergroup (LHG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): Kirkcolm Formation
Stratotypes:
Type Area  March Burn, Kello Water, Euchan Water, Glen Burn. Sheet S15W. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S015