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Earth Science Conservation Review

Summary Full report
Tedd Cross Roads Segment, CloghfinFermanagh
Site number:315File Number:H26
ESCC:EO
Locality Type:Inland exposure Status: ASSI
Grid Reference: H25866148 Centroid
Google maps: 54.50082,-7.60176
County: FermanaghCouncil area:Fermanagh & Omagh District Council
Period:Devonian
Stages:Middle Devonian, Upper Devonian
Lithostrat:Fintona Group, Tedd Formation
Site Description
image: 0315a.jpg Field exposure at Cloghfin, Tedd Townland, Co.Fermanagh; a unique locality and horizon of green mudstones (marked by hammer) with miospores in the Tedd Formation, Fintona Block.
Field exposure at Cloghfin, Tedd Townland, Co.Fermanagh; a unique locality and horizon of green mudstones (marked by hammer) with miospores in the Tedd Formation, Fintona Block.
Description:
The occurrence of green mudstones within the Tedd Formation at Cloghfin is unique in the Tedd Cross Roads Segment and is located some 300m above the structural base of the formation. The mudstone is about 40cm thick and is part of a sequence comprising purple-brown fine-grained sandstones and siltstones with thin layers of chocolate-brown mudstone.
image: 0315b.jpg Close up of green mudstone horizon with miospores, in the Tedd Formation (ruler 0.14m).
Close up of green mudstone horizon with miospores, in the Tedd Formation (ruler 0.14m).
The outcrop lies on the north side of a shallow seasonal pond and the strata, which dip south-southeastwards at 60 deg., are located on the south side of a low linear ridge that can be traced to the east for about 150m, and is only one of many rock ridges that are typical of this part of the segment. Well preserved small scale desiccation cracks, frequently imposed on asymmetrical ripples, are common, the latter indicating currents flowing updip, to the north.

A total of 14 samples of green mudstone from different levels in the bed were processed for miospores. Of these only 6 were productive and even those residues produced extremely sparse yields of poorly preserved miospores including the following taxa: Apiculiretusispora sp., Densosporites sp., Dibolisporites sp., Dictyotriletes sp., Emphanisporites sp., E. annulatus McGregor, ?Hymenozonotriletes sp., and Retusotriletes sp.

Based on the taxa recorded it is tentatively suggested that the assemblage is of Middle-Upper Devonian age.
Notes:
For general information and reference list on the Tedd Formation see Key Site 1149 - Tedd Formation; Tedd Cross Roads Segment.

For general information and reference list on the Devonian System in N. Ireland see Key Site 1147 - The Devonian System in N. Ireland - Introduction.
Keywords
Rocks:Mudstone, Sand, Sandstone, Siltstone
Fossil Groups:Miospore, Miospores
Structures:dessication cracks, ripple marks
References (1)
Mitchell, W.I., 1992. The origin of Upper Palaeozoic sedimentary basins in Northern Ireland and relationships with the Canadian Maritime Provinces. Special Publications of the Geological Society of London, vol. 62 In Basins on the Atlantic Seaboard: Petroleum Geology, Sedimentology and Basin Evolution., pp.191-202.
Map(s): GSNI 1:50,000 Sheet 45 (Enniskillen);
GSNI 1:50,000 Sheet 46 (Clogher);
O.S. 1:50,000 Sheet 17 (Lower Lough Erne).
Record type: Environment Serv. GIS, ESCR report    
Entered by: Doughty, P.J.
Last updated:8 Jan 2005
 Enlander, I., Dempster, M. & Doughty, P., 2026. Tedd Cross Roads Segment, Cloghfin, County Fermanagh, site details. [In] Earth Science Conservation Review.
https://www.habitas.org.uk/escr/site.php?item=315. Accessed on 2026-11-08.

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