The BGS Lexicon of Named Rock Units — Result Details

Ardwell Subgroup

Computer Code: AWL Preferred Map Code: AWL
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Sandstone, siltstone, mudstone, limestone and conglomerate; highly fossiliferous in places (shelly faunas).
Definition of Lower Boundary: Coincides with lower boundary of the Balclatchie Formation (on coastal outcrops) and lower boundary of the Craighead Limestone Formation (in the Craighead Inlier).
Definition of Upper Boundary: Coincides with upper boundary of the Ardwell Farm Formation.
Thickness: To c.1600m
Geographical Limits: Girvan area, southwest Scotland.
Parent Unit: Ardmillan Group (AMN)
Previous Name(s): Ardmillan Group (AMN)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Coast south of Girvan, southwest Scotland. Williams, 1962. See also consituent Ardwell Farm, Balclatchie and Craighead Limestone formations. 
Reference(s):
Fortey, R A, Harper, D A T, Ingham, J K, Owen, A W, Parkes, M A, Rushton, A W A and Woodcock, N H. 2000. A revised correlation of Ordovician rocks in the British Isles. Geological Society Special Report, No.24. 
Williams, A, 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. Memoir of the Geological Society of London, No.3. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable