| Site Type: | Sinkhole | | Site Status: | ASSI | | Council area: | Fermanagh & Omagh District Council | | Grid Reference: | H09444666 | | Bing maps: | 54.36844,-7.85536 | | Google maps: | 54.36844,-7.85536 | | Rocks |
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| Rock Age: | Quaternary, Carboniferous (Holocene, Visean) | | Rock Name: | Dartry Limestone Formation, Knockmore Limestone Member | | Rock Type: | Chert, Limestone | | Interest |
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| Other interest: | cave, sinkhole, sump |
| Summary of site: |
| Mad Pot is developed in the cherty beds of the Dartry Limestone and changes character once it penetrates the Knockmore Limestone Member. A sink hole cuts through a peat-covered limestone platform. A series of chert floors, previously blocking access, have been broken up to give entry to a north-west trending rift which can be descended by climbing down about 10m. At this point the system enters the Knockmore Limestone and immediately the cave develops vertically. A short crawl leads to the head of a 22m vertical pitch with a further crawl at its base leading to a completely flooded section (a sump). Above the sump is a chamber with a high roof (an aven). Historically, the sump was dived to a depth of 8m before visibility was lost; it is now completely blocked by silt. |
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