Computer Code: |
BBSF |
Preferred Map Code: |
BBSF |
Status Code: |
Full |
Age range: |
Arundian Substage (CJ)
— Asbian Substage (CR) |
Lithological Description: |
Mudstone, medium to dark grey, micaceous, calcareous, bioclastic, with thin to thick blue-grey, argillaceous, very fossiliferous limestones, thin calciturbidites and sandstones. |
Definition of Lower Boundary: |
Conformable with underlying siltstone/sandstone dominated sequence of the Drumchorick Siltstone Formation and Mullaghmore Sandstone Formation (only in type area). |
Definition of Upper Boundary: |
Conformable, rapid transition with succeeding limestone dominated sequence of the Glencar Limestone Formation, in the type area. |
Thickness: |
c.60 - 120 metres. |
Geographical Limits: |
Northwest Carboniferous basin of Ireland. |
Parent Unit: |
Tyrone Group (TYRO)
|
Previous Name(s): |
Calp Shale of the Calp or Middle Limestone [Obsolete Name and Code: Use BBSF]
(-1970)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Well-exposed, in stream and cliff sections, all round the lower slopes of the Dartry Mountains and the Benbulben Range, County Sligo, Ireland, centred on 10km Grid Square H 17 34. |
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. |
Higgs, K, 1984. Stratigraphic palymology of the Carboniferous rocks in northwest Ireland. Bulletin of the Geological Survey of Ireland, Vol.3, No.3, 171-202. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
N32
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