The BGS Lexicon of Named Rock Units — Result Details

Bundoran Shale Formation

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