The BGS Lexicon of Named Rock Units — Result Details

Dartry Limestone Formation

Computer Code: DARL Preferred Map Code: DARL
Status Code: Full
Age range: Asbian Substage (CR) — Asbian Substage (CR)
Lithological Description: Limestone, dark grey, argillaceous, sparsely fossiliferous with disseminated chert in tabular or nodular form; interbedded with thin, dark grey to black silty, micaceous shale.
Definition of Lower Boundary: Conformable and abrupt, planar or interdigitating with Glencar Limestone Formation.
Definition of Upper Boundary: Disconformable with succeeding Meenymore Formation, locally erosional.
Thickness: Up to 350m
Geographical Limits: Northwest Carboniferous basin of Ireland.
Parent Unit: Tyrone Group (TYRO)
Previous Name(s): Upper Limestone (ULE)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Extensively exposed on higher ground, major scarp-forming limestone and the central plateau of the Benbulben Range and Dartry Mountains, Co. Sligo, Ireland. Centred on Grid Square C 17 18. 
Reference(s):
Brunton, C H C and Mason, T R, 1979. Palaeoenvironments and correlation of the Carboniferous rocks in west Fermanagh, Northern Ireland. Bulletin of the British Museum of Natural History (Geology), Vol.32, 91-108. 
Oswald, D H, 1955. The Carboniferous rocks between the Ox Mountains and Donegal Bay. Quarterly Journal of the Geological Society of London, Vol.111, Part 2, 167-186. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
N32