| Site Type: | Sinkhole | | Site Status: | ASSI | | Council area: | Fermanagh & Omagh District Council | | Grid Reference: | H11834513 | | Bing maps: | 54.35491,-7.81849 | | Google maps: | 54.35491,-7.81849 | | Rocks |
|---|
| Rock Age: | Quaternary, Carboniferous (Holocene, Visean) | | Rock Name: | Carn Limestone Member | | Rock Type: | Limestone, Mudstone, Shale | | Interest |
|---|
| Other interest: | doline, sinkhole |
| Summary of site: |
| Pollkerran (sometimes written Pollkeeran) is a large collapse crater (a doline) in the Carn Limestone that formed when the roof of a large cavern below became unstable and fell in. It is now a sink hole, taking the flow of a small stream. The unstable boulders from the collapse form a choke and, although digging has penetrated 15m, bedrock was not reached. | | The stream sinking here emerges 2km to the north in Carrickbeg Rising Cave. | | The Carn Limestone is exposed in the walls of this doline. | | This is an extremely dangerous descent, not to be undertaken without considerable caving experience. |
|