The BGS Lexicon of Named Rock Units — Result Details
Ballyshannon Limestone Formation
| Computer Code: | BAL | Preferred Map Code: | BAL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Chadian Substage (CI) — Arundian Substage (CJ) | ||
| Lithological Description: | Limestone, dark blue-grey, bioclastic, argillaceous packstones, interbedded with dark grey, silty shale; rarely with chert nodules in upper part; named members include sandstones. | ||
| Definition of Lower Boundary: | Lowest member of the formation, the Gortnaree Sandstone Member, conformably succeeds the Termon River Limestone Formation. | ||
| Definition of Upper Boundary: | Highest member of the formation, the Ederny Limestone Member, is overlain disconformably by the normal Bundoran Shale Formation or the sandstone basal member in the Kesh-Omagh area and southwest County Fermanagh. | ||
| Thickness: | 120 - 450 metres. | ||
| Geographical Limits: | Northwest Carboniferous basin of Ireland. | ||
| Parent Unit: | Tyrone Group (TYRO) | ||
| Previous Name(s): | Pettigo Limestone Group [Obsolete Name And Code: Use BAL]
(PELG)
Lower Limestone (GLRB) Lower Limestone (GLRB) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | The area around Ballyshannon, County Sligo. In a road cutting, 1.6 km east of the town and south of Knader Lough, basal dolomitic conglomeratic limestones rest unconformably on 'Moine' quartzites. Centred on 10 km Grid Square C 18 36. | ||
| Reference Section | Corn Quarry, 2.1 km south east of Ederny, County Fermanagh. This quarry and other abandoned sites on Corn Ridge expose completely the top 50 m of the formation including some new members. | ||
| Reference(s): | |||
| Oswald, D H, 1955. The Carboniferous rocks between the Ox Mountains and Donegal Bay. Quarterly Journal of the Geological Society of London, Vol.111, Part 2, 167-186. | |||
| Brunton, C H C, and Mason, T R. 1979. Palaeoenvironments and correlation of the Carboniferous rocks in west Fermanagh, Northern Ireland. Bulletin of the British Museum of Natural History (Geology), Vol. 32, 91-108. | |||
| Simpson, I M, 1954. The Lower Carboniferous stratigraphy of the Omagh Syncline, Northern Ireland. Quarterly Journal of the Geological Society of London, Vol.110, 391-408. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| N32 | |||