The BGS Lexicon of Named Rock Units — Result Details

Drumlish Conglomerate Formation

Computer Code: DISH Preferred Map Code: DISH
Status Code: Full
Age range: Duckmantian Substage (CB) — Duckmantian Substage (CB)
Lithological Description: Conglomerate, grey-purple, massive beds with cobbles and pebbles of volcanic and metamorphic origin; volcaniclastic, coarse sand matrix, channels cross-bedded; sandstone, purple-red, coarse-grained.
Definition of Lower Boundary: Abrupt and probably disconformable on the Drumgivery Limestone Member, at top of Tullanaglare Mudstone Formation.
Definition of Upper Boundary: Not exposed; faulted out.
Thickness: At least 1000m.
Geographical Limits: Milltown Segment of the Fintona Block, Northern Ireland.
Parent Unit: Slievebane Group (SLI)
Previous Name(s): Drumlish Formation (-1503)
Alternative Name(s): none recorded or not applicable
Reference Section  Extensive area of superficial deposit-free hills south of the Castle Archdale Fault between Tullanaguiggy in the west and Knocknahorn, 8km to the north-east. 
Type Section  Working quarry in Straduff Townland, County Tyrone, 6.75km east of Lack; exposes up to 80m of conglomerate near base of formation. 
Mitchell, W I, Johnston, T P and Legg, I C. 2004. Geology of the country around Kesh, Co. Fermanagh and Omagh, Co. Tyrone. Geological Sheets 32 and part of 31 (Kesh) and 33 (Omagh). Geological Survey of Northern Ireland. Technical Report GSNI 04/1. 
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. 
Simon, J B, 1984. Sedimentation and tectonic setting of the Lower Old Red Sandstone of the Fintona and Curlew Mountain district. Irish Journal of Earth Sciences, Vol.6, 213-228. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: