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 (-1993)
Ballinamallard Formation (-3857)
Alternative Name(s): Shanmullagh Formation
Stratotypes:
Type Section  The Ballinamallard River, County Fermanagh, Northern Ireland, 300m east of the village. 
Reference(s):
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. 
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, Vol.127 (5), 407-426. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
N45 N33