| Previous Site | Next Site |
Earth Science Conservation Review
| Reyfad-Carrickbeg; Pollnacrom | Fermanagh |
| Site number: | 392 | File Number: | H04 |
| ESCC: | IC | ||
| Locality Type: | Cave | Status: | ASSI |
| Grid Reference: | H08534702 | ||
| Google maps: | 54.37205,-7.86919 | ||
| County: | Fermanagh | Council area: | Fermanagh & Omagh District Council |
| Period: | Quaternary, Carboniferous | ||
| Stages: | Holocene, Visean | ||
| Lithostrat: | Dartry Limestone Formation, Knockmore Limestone Member | ||
| Site Description | |
|---|---|
| Description: | |
UNDERGROUND KARST The Reyfad-Pollnacrom-Polltullybrack cave system is developed mainly in the Knockmore Limestone Member. The regional dip is typically 10-20 degrees, varying in direction between west and south. The cave formation is predominantly aligned on two sets of fractures, trending approximately 340° and 010°. There are only a few E-W controlling joints. The horizontal part of the cave has formed between 230m and 130m amsl. The 65m entrance shafts of Pollnacrom break through the cherty limestone near the surface into the massive Knockmore Limestones. The stream sinking at Pollnacrom then follows a joint northwest for a short distance before changing direction on to one of the 010° trending fractures which continues for almost 600m to a sump. The passage leading southwest from the shaft leads to a chamber with gypsum deposits and a mud crawl to the Heaven and Hell Series. This, in turn, connects to the upstream section of Scrapers' Passage. | |
| Notes: | |
Pollnacrom is a feature of the Reyfad-Carrickbeg area of the Belmore, Ballintempo and Tullybrack Uplands. For general information on the systems and features of Reyfad-Carrickbeg, including this one, and a reference list, see site description 'Belmore, Ballintempo & Tullybrack Uplands; Reyfad-Carrickbeg'. | |
| Keywords | |
|---|---|
| Minerals: | Gypsum |
| Rocks: | Chert, Limestone |
| Structures: | joints |
| Geomorph: | cave, sinkhole, sump |
| Measurements | |||||
|---|---|---|---|---|---|
| Length: | 665 m+ | Width: | Height: | ||
| Depth: | Area: | ||||
| Record type: | ESCR report | ||
| Entered by: | Doughty, P.J. | ||
| Last updated: | 24 Dec 2003 | ||
| Enlander, I., Dempster, M. & Doughty, P., 2026. Reyfad-Carrickbeg; Pollnacrom, County Fermanagh, site details. [In] Earth Science Conservation Review. https://www.habitas.org.uk/escr/site.php?item=392. Accessed on 2026-11-08. |
| Previous Site | Next Site |