The BGS Lexicon of Named Rock Units — Result Details

Inverclyde Group

Computer Code: INV Preferred Map Code: INV
Status Code: Full
Age range: Courceyan Substage (CF) — Chadian Substage (CI)
Lithological Description: Sandstones containing pedogenic limestone and dolomite nodules ('cornstones'), fine-grained carbonate as beds, nodules and pebbles, and grey and brown mudstones containing thin beds of limestone and dolomite ('cementstones'); subordinate siltstone and mudstone.
Definition of Lower Boundary: At base of Kinnesswood Formation - at incoming of common pedogenic carbonate above a red-bed sequence, the Stratheden Group. Normally conformable, locally unconformable in west.
Definition of Upper Boundary: At top of Clyde Sandstone Formation (in west) or of Tyninghame Formation (Lothian) or of Balcomie Beds (Fife); at incoming of coal, blackshale, seatearth or volcanic rocks of the Strathclyde Group; conformable or unconformable.
Thickness: To c. 1500m
Geographical Limits: Midland Valley of Scotland.
Parent Unit: Not Applicable (-)
Previous Name(s): Cementstone Group (B) [Obsolete Name And Code: See INV and BGN; CMNT Offshore] (CMST)
Cementstone Group (A) [Obsolete Name And Code: See INV and BGN; CMNT Offshore] (CST)
Stirling Group [Obsolete Name And Code: Use INV] (SLG)
Cementstone Group (*172)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Greenock, Inverclyde, Scotland. (Ref Sections: See Type Sections of component units: Kinnesswood, Ballagan, Clyde Sandstone and Tyminghame formations and Balcomie Beds). 
Reference(s):
Chisholm, J I, MacAdam, A D, Brand, P J. 1989. Lithostratigraphical classification of Upper Devonian and Lower Carboniferous rocks in the Lothians. British Geological Survey Technical Report, WA/89/26. 
MacGregor, A G, 1960. Division of the Carboniferous on Geological Survey Scottish Maps. Bulletin of the Geological Survey of Great Britain, No.16, 127-130. 
Chisholm, J I and Dean, J M, 1974. The Upper Old Red Sandstone of Fife and Kinross: A fluviatile sequence with evidence of marine incursion. Scottish Journal of Geology, Vol. 10, 1-30. 
Browne, M A E, 1980. The Upper Devonian and Lower Carboniferous (Dinantian) of the Firth of Tay, Scotland. Report of the Institute of Geological Sciences, No. 80/9. 
Forsyth, I H and Chisholm, J I, 1977. The geology of east Fife. Memoirs of the Geological Survey of Great Britain. 
Paterson, I B and Hall, I H S, 1986. Lithostratigraphy of the late Devonian and early Carboniferous rocks in the Midland Valley of Scotland. British Geological Survey Report, 18/3. 
Francis, E H, Forsyth, I H, Read, W A and Armstrong, M. 1970. The geology of the Stirling district. Memoir of the Geological Survey of Great Britain, Sheet 39 (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S029 S012 S015 S007 S024 S024 S038 S034 S048 S048 S049 E005 S030 S030 S038 S039 S039 S040