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Earth Science Conservation Review
| Croagh Mountain - Structural | Fermanagh |
| Site number: | 642 | ||
| Locality Type: | Crags, Inland exposure | Status: | ASSI |
| Grid Reference: | G985630 Centroid | ||
| Google maps: | 54.51585,-8.02314 | ||
| County: | Fermanagh | Council area: | Fermanagh & Omagh District Council |
| Period: | Precambrian | ||
| Stages: | Moinian | ||
| Lithostrat: | Lough Derg Group, Slishwood Division, Lough Derg Inlier | ||
| Site Description | |
|---|---|
| Highlights: | |
This site contains high quality outcrop and examples of intense polyphase deformation including tight harmonic and disharmonic ductile folds. | |
| Introduction: | |
Croagh Mountain is situated approximately 6km NE of Belleek in remote moorland close to the Donegal-Fermanagh border. Access is via a road and track which passes between Croagh Mountain in County Fermanagh and Breesy Hill in County Donegal (Fig. 4). | |
| Description: | |
The rocks on Croagh Mountain are typical of the Lough Derg Inlier (Lough Derg Group). They are mainly quartz-feldspar-mica psammites with minor pelite. Numerous, early-formed basaltic intrusions have been deformed and now form disrupted masses and augened pods of metabasite within the original sedimentary succession. Structurally, these strata form part of a large open NE plunging antiform known as the Lough Derg Antiform. They have a regionally dominant foliation, which has a consistent NNE-SSW strike, and which dips at 80°E. | |
| Notes: | |
For general information on the Structural Geology of Northern Ireland, directions to other Structural Geology sites and an extensive reference list see Key Site 641 - Introduction to the Structural Geology of N. Ireland. See also Key Site 125 - Croagh Mountain [Precambrian Stratigraphic block]. | |
| Keywords | |
|---|---|
| Rocks: | Metabasite, Pelitic rock, Psammite |
| Structures: | antiform |
| Access | |
|---|---|
| Approach: | Access is via a road and track which passes between Croagh Mountain in County Fermanagh and Breesy Hill in County Donegal (Fig. 4). |
| Record type: | ESCR report | Recorded by: | T.P. Johnston |
| Entered by: | E M Porter | ||
| Last updated: | 23/09/03 | ||
| Enlander, I., Dempster, M. & Doughty, P., 2026. Croagh Mountain - Structural, County Fermanagh, site details. [In] Earth Science Conservation Review. https://www.habitas.org.uk/escr/site.php?item=642. Accessed on 2026-11-06. |
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