The BGS Lexicon of Named Rock Units — Result Details

Kirkwood Formation

Computer Code: KRW Preferred Map Code: KRW
Status Code: Full
Age range: Asbian Substage (CR) — Brigantian Substage (CX)
Lithological Description: Tuffaceous mudstones and tuffs.
Definition of Lower Boundary: Taken at the junction of tuffaceous mudstones and tuffs with underlying basaltic lavas of the Clyde Plateau Volcanic Formation
Definition of Upper Boundary: Taken at the base of the overlying Lawmuir Formation or Lower Limestone Formation. The boundary is commonly irregular with interdigitation of lithologies.
Thickness: Variable, to c.35m
Geographical Limits: Not defined.
Parent Unit: Strathclyde Group (SYG)
Previous Name(s): Kirkwood Formation (KRW)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Between 39.77 and 75.30m in the BGS Kirkwood Borehole (Reg.No. NS34NE/11) 
Reference(s):
Monro, S K, 1982. Sedimentation, Stratigraphy and Tectonics of the Dalry Basin, Ayrshire. Unpublished PhD Thesis, University of Edinburgh. 
Browne, M A E, Dean, M T, Hall, I H S, McAdam, A D and Monro, S K, 1995. A review of the lithostratigraphy of the Carboniferous rocks of the Midland Valley of Scotland. BGS Technical Report, WA/95/25R. 
Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S030 S030 S022 S023 S031 S039