The BGS Lexicon of Named Rock Units — Result Details

Mullaghmore Sandstone Formation

Computer Code: MMS Preferred Map Code: MMS
Status Code: Full
Age range: Arundian Substage (CJ) — Arundian Substage (CJ)
Lithological Description: Sandstone, brown to grey, fine- to coarse-grained, silty, bioturbated interbedded with micaceous, carbonaceous mudstone and siltstone; immediately overlying basal Dromore Sandstone Member, are thin stromatolitic limestones, black ostracodal packstones and bituminous pyritous shales.
Definition of Lower Boundary: Lower boundary, represented by base of Dromore Sandstone Member; is sharply conformable on Bundoran Shale Formation.
Definition of Upper Boundary: Conformable at sharp base of Drumchorick Siltstone Formation.
Thickness: c.200m
Geographical Limits: Northwest Carboniferous Basin of Ireland.
Parent Unit: Tyrone Group (TYRO)
Previous Name(s): Calp Sandstone Of The Calp Or Middle Limestone (-1703)
Clonelly Sandstone Group [Obsolete Name And Code: Use MMS] (CLSP)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Fringing the north side of the Dartry Mountains and Benbulben Range from Lough Melvin, in the east, to Mullaghmore Head and Dernish Island, to the west, Counties Leitrim and Sligo, Southern Ireland, centred on 10km Grid Square C 17 35 
Reference Section  Almost complete, if faulted section, in the Bannagh River between Drumcurren Bridge (basal beds) in the south and the top of the main waterfalls (upper beds), c.1km to the north. 
Reference(s):
Simpson, I M, 1954. The Lower Carboniferous stratigraphy of the Omagh Syncline, Northern Ireland. Quarterly Journal of the Geological Society of London, Vol.110, 391-408. 
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