The BGS Lexicon of Named Rock Units — Result Details

Tyrone Volcanic Group

Computer Code: TVG Preferred Map Code: TVG
Status Code: Full
Age range: Arenig Series (OR) — Abereiddian Stage (O2)
Lithological Description: Heterogeneous volcanic sequence: tuff, agglomerate, chert, with pillow lava horizons. Outcrop tectonised and metamorphosed in greenschist facies.
Definition of Lower Boundary: Faulted off.
Definition of Upper Boundary: Faulted off.
Thickness: Estimated 4-5km
Geographical Limits: Central Co. Tyrone, Northern Ireland.
Parent Unit: Not Applicable (-)
Previous Name(s): Tyrone Igneous Series (-581)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Principal reference section: Beaghbeg Townland Area, Co.Tyrone. 
Type Area  Mid Tyrone; Mountfield [H 535 786] to Creggan [H 630 790] to Tullybrick [H 730 900]. 
Reference(s):
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. 
Geological Survey of Northern Ireland 1979. Pomeroy, sheet 34, solid, 1:50 000. [Southampton, Ordnance Survey for Institute of Geological Sciences.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
N34