The BGS Lexicon of Named Rock Units — Result Details
Derryloran Formation
| Computer Code: | DLN | Preferred Map Code: | DLN |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Visean Age (CV) — Visean Age (CV) | ||
| Lithological Description: | Conglomerate, grit, sandstone and minor sandy dolomitic limestone. | ||
| Definition of Lower Boundary: | Unconformable on pre-Carboniferous basement. | ||
| Definition of Upper Boundary: | None | ||
| Thickness: | 140-200m | ||
| Geographical Limits: | South-east Tyrone, Northern Ireland. | ||
| Parent Unit: | Armagh Group (ARMA) | ||
| Previous Name(s): | Derryloran Grit Formation (Obsolete Name And Code: Use DLN)
(-866)
[Obsolete Code: Use DLN] (*772) Derryloran Grit Formation [Obsolete Name And Code: Use DLN] (DLG) Derryloran Grit Member [Obsolete Name and Code: Use DLN] (-213) Derryloran Grits [Obsolete Name and Code: Use DLN] (-1505) Upper Calciferous Sandstone [Obsolete Name and Code: Use DLN] (-1506) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Ballinderry River, west of Cookstown. Kildress - Derryloran Bridge Drum Road - Bridge (Killymoon). | ||
| Reference(s): | |||
| Geological Survey of Northern Ireland 1979. Pomeroy, sheet 34, solid, 1:50 000. [Southampton, Ordnance Survey for Institute of Geological Sciences.] | |||
| Geological Survey of Northern Ireland, 1983. Cookstown sheet 27, solid 1:50,000. | |||
| Eagan, F W, 1881. Explanatory memoir to accompany sheet 27 of the maps of the Geological Survey of Ireland | |||
| Fowler, A and Robbie, J A, 1961. The geology of the country around Dungannon. Memoir of the Geological Survey of Northern Ireland. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| N27 N34 N35 | |||