| Computer Code: |
GRLF |
Preferred Map Code: |
GRLF |
| Status Code: |
Full |
| Age range: |
Asbian Substage (CR)
— Asbian Substage (CR) |
| Lithological Description: |
Limestone, grey, weathering pink-brown, argillaceous, bioclastic, interbedded with equal thickness of dark grey shale and mudstone. |
| Definition of Lower Boundary: |
Conformable but rapid from underlying Benbulben Shale Formation. |
| Definition of Upper Boundary: |
Conformable; always abrupt, locally interdigitating with succeeding Dartry Limestone Formation. |
| Thickness: |
100 - 180m |
| Geographical Limits: |
Northwest Carboniferous basin of Ireland. |
| Parent Unit: |
Tyrone Group (TYRO)
|
| Previous Name(s): |
Calp Limestone of the Calp or Middle Limestone [Obsolete Name and Code: Use GRLF]
(-2217)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Numerous stream sections and "steep, precipitous scarps" in the western part of the Dartry Mountains, County Sligo, Ireland. Centred on Grid Square C 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. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
N32
|
