The BGS Lexicon of Named Rock Units — Result Details

Fintona Group

Computer Code: FIN Preferred Map Code: notEntered
Status Code: Full
Age range: Mid Devonian Epoch (DM) — Late Devonian Epoch (DU)
Lithological Description: Clastic sediment, red-bed conglomerates, sandstones, siltstones and mudstones; contemporaneous acid volcanic rocks in the lower levels.
Definition of Lower Boundary: Unconformable in the northeast and east on the early Caledonian Tyrone Igneous Complex and the Lower Silurian at Pomeroy. Elsewhere in Fintona Block the contact is faulted.
Definition of Upper Boundary: Either not exposed and faulted out, or overlain unconformably by Lower Carboniferous basal clastics and Visean marine sediments on the south side of the Fintona Block.
Thickness: Difficult to gauge owing to lack of a distinctive lithostratigraphy. Estimated unreliably as c.3000m in east outcrop (1:50,000 Sheet 34, Pomeroy).
Geographical Limits: The Fintona Block, Northern Ireland.
Parent Unit: Not Applicable (-)
Previous Name(s): Fintona Beds (-3404)
Dingle Beds (-1993)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Part of the Fintona Block between Irvinestown, Drumore, Trillick and Fintona. Intermittent exposure in quarries, pits and stream sections. 
Reference(s):
House, M R, Richardson, J B, Chaloner, W G, Allen, J R L, Holland, C H and Westoll, T S. 1977. A Correlation of Devonian rocks of the British Isles. Geological Society of London, Special Report No.8, Scottish Academic Press, Edinburgh. 
Wilkinson, S B and Kilroe, J R, 1886. Explanatory Memoir to accompany Sheet 33 of the map of the Geological Survey of Ireland including the district around Omagh, Fintona and Irvinestown. Her Majesty's Stationery Office, 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. 
Nolan, J, 1880. On the Old Red Sandstone of the north of Ireland. Quarterly Journal of the Geological Society of London, Vol.36, 529-535. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable