The BGS Lexicon of Named Rock Units — Result Details

Ballinamallard Mudstone Formation

Computer Code: BLM Preferred Map Code: BLM
Status Code: Full
Age range: Brigantian Substage (CX) — Pendleian Substage (CE)
Lithological Description: Mudstone; grey-red and purple-red mottled, with micaceous siltstone and thin, fine-grained sandstones.
Definition of Lower Boundary: Not exposed, presumed to be gradation from underlying Ballyreagh Conglomerate Formation.
Definition of Upper Boundary: Not exposed, everywhere faulted out.
Thickness: c.1000 metres.
Geographical Limits: The south-western part of the Fintona Block, Northern Ireland.
Parent Unit: Kilskeery Group (KILS)
Previous Name(s): DINGLE BEDS
BALLINAMALLARD FORMATION
Alternative Name(s): SHANMULLAGH FORMATION
Stratotypes:
Type Section  The Ballinamallard River, County Fermanagh, Northern Ireland, 300m east of the village. 
Reference(s):
Mitchell, W I and Owens, B, 1990. The geology of the western part of the Fintona Block, Northern Ireland: evolution of Carboniferous basins. Geological Magazine, No.127 (5), 407-426. 
Wilkinson S B. 1882. The geology of the country around Enniskillen, Fivemiletown, Trillick, Lisbellaw and Maguiresbridge.Explanatory Memoir to accompany Sheet 45 of the maps of the Geological Survey of Northern Ireland, Dublin and London. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
N45 N33