The BGS Lexicon of Named Rock Units — Result Details

Gortfinbar Conglomerate Formation

Computer Code: GOCF Preferred Map Code: GOCF
Status Code: Full
Age range: Mid Devonian Epoch (DM) — Late Devonian Epoch (DU)
Lithological Description: Pebble to boulder conglomerates with sandstone beds; 2 horizons of contemporaneous 'andesitic' lavas.
Definition of Lower Boundary: Very confused relationship. May be unconformable on underlying Shammaghery Sandstone Formation, may be normal but abrupt, commonly faulted or not exposed.
Definition of Upper Boundary: Supposedly interfingers laterally with and merges gradationally upwards into Raveagh Sandstone Formation
Thickness: From about 2440 m - 2720 m thick.
Geographical Limits: none recorded or not applicable
Parent Unit: Fintona Group (FIN)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Central Co. Tyrone between Pomeroy and Fintona, between Tempo-Sixmilecross Fault and the Ballygawley Fault. 
Reference Section  Bernisk Glen, 3.5km ESE of Sixmilecross upstream of C-class road bridge. 
Geological Survey of Northern Ireland 1979. Pomeroy, sheet 34, solid, 1:50 000. [Southampton, Ordnance Survey for Institute of Geological Sciences.] 
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: