| Computer Code: |
BUNS |
Preferred Map Code: |
BUNS |
| Status Code: |
Full |
| Age range: |
Arundian Substage (CJ)
— Arundian Substage (CJ) |
| Lithological Description: |
Mudstone, dark grey, calcareous, fossiliferous with thin to thick bioclastic limestones. |
| Definition of Lower Boundary: |
Skea Sandstone Member (basal beds of the formation) rest disconformably on top of Ballyshannon Limestone Formation. |
| Definition of Upper Boundary: |
Increasing silt, mica and sand content in top part of formation, beneath coarse sandstones of basal Dromore Member of the Mullaghmore Sandstone Formation. |
| Thickness: |
80 - 450m |
| Geographical Limits: |
Northwest Carboniferous basin of Ireland. |
| Parent Unit: |
Tyrone Group (TYRO)
|
| Previous Name(s): |
Lower Calp Shale Of The Calp Or Middle Limestone
(-735)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Many excellent sections occur in this formation of which that below is just 'one'. West flowing stream 1.1km north east of Scraghy Quarries - exposes upper part of formation. |
| Type Area |
Coastal section at Bundoran, County Sligo, between Fairies Bridge and Aughrus Point; also northwestern slopes of the Benbulben Range between Carney and Kinlough, centred on 10 km Grid Square C 17 35. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
N32
|
