The BGS Lexicon of Named Rock Units — Result Details

Tyrone Plutonic Group

Computer Code: TPG Preferred Map Code: TPG
Status Code: Full
Age range: Ordovician Period (O) — Ordovician Period (O)
Lithological Description: Hornblende gabbro and diorite with cross-cutting invasive dyke systems.
Definition of Lower Boundary: Faulted.
Definition of Upper Boundary: Faulted.
Thickness: Unknown
Geographical Limits: Mid-Ulster, Co.Tyrone c.10km west of Cookstown.
Parent Unit: Not Entered (?)
Previous Name(s): Tyrone Igneous Series (Plutonic Rocks) (-2497)
Tyrone Basic Plutonic Complex (Obsolete Name And Code: Use TPG) (-3087)
Replaced By Tyrone Plutonic Group (*397)
Tyrone Basic Plutonic Complex [Obsolete Name And Code: Use TPG] (DATY)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Carrickmore Quarry (sheeted dyke complex) 
Type Area  East Tyrone, west of Cookstown, east of Beaghbeg, and in vicinity of Carrickmore. 
Reference Section  Principle reference section. Black Rock, c500m south of Beaghmore Stone Circles, Beaghmore Townland, Co. Tyrone (gabbro/diorite complex) 
Reference(s):
Geological Survey of Northern Ireland. Draperstown, sheet 26, solid, 1:50,000 
Geological Survey of Northern Ireland, 1983. Cookstown sheet 27, solid 1:50,000. 
Hartley, J J. 1933. The geology of north-eastern Tyrone and the adjacent portions of County Londonderry. Proceedings of the Royal Irish Academy, Vol.41, section B, 218-85. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
N27