The BGS Lexicon of Named Rock Units — Result Details

Keenaghan Shale Formation

Computer Code: KEEN Preferred Map Code: KEEN
Status Code: Full
Age range: Chadian Substage (CI) — Chadian Substage (CI)
Lithological Description: Shale, dark grey, silty, very micaceous, non-calcareous; thin beds of grey-blue, muddy unfossiliferous micrite and grey, coarse-grained, calcareous sandstone.
Definition of Lower Boundary: Rests unconformably on the Moine Lough Derg Group psammites.
Definition of Upper Boundary: Conformable and gradational with overlying Ballyshannon Limestone Formation.
Thickness: 20 - 25m
Geographical Limits: Belleek-Kesh area of the northwest Carboniferous basin of Ireland.
Parent Unit: Tyrone Group (TYRO)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Temporary excavation of lower part of formation at cottage on north shore of Keenaghen Lough. 
Mitchell, W I, Johnston, T P and Legg, I C. 2004. Geology of the country around Kesh, Co. Fermanagh and Omagh, Co. Tyrone. Geological Sheets 32 and part of 31 (Kesh) and 33 (Omagh). Geological Survey of Northern Ireland. Technical Report GSNI 04/1. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: