The BGS Lexicon of Named Rock Units — Result Details

Iniscarn Formation

Computer Code: IS Preferred Map Code: IS
Status Code: Full
Age range: Tournaisian Stage (CT) — Tournaisian Stage (CT)
Lithological Description: Conglomerate and breccia with subordinate argillaceous beds.
Definition of Lower Boundary: Rests unconformably on Pre-Carboniferous basement (Dalradian - Ordovician).
Definition of Upper Boundary: Not known; probably conformable with Altagoan Formation.
Thickness: 600m+
Geographical Limits: Desertmartin area, Co.Londonderry, Northern Ireland.
Parent Unit: Tyrone Group (TYRO)
Previous Name(s): Lower Calciferous Sandstone (-1615)
Lower Calciferous Sandstone Measures [Obsolete Name And Code: See IS] (LCLC)
Iniscarn Sandstone Formation (-2867)
Alternative Name(s): none recorded or not applicable
Type Section  Reubens Glen 
Reference Section  Golan Glen 
Egan, F W, 1881. Explanatory memoir to accompany sheet 27 of the maps of the Geological Survey of Ireland. Dublin. 
Owens, B, Gueinn, K J and Cameron, I B, 1977. A Tournaisian miospore assemblage from the Altagoan Formation (Upper Calciferous Sandstone) Draperstown, Northern Ireland. Pollen et Spores, Vol. XIX, No.2. 
Geological Survey of Northern Ireland, 1983. Cookstown sheet 27, solid 1:50,000. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: