The BGS Lexicon of Named Rock Units — Result Details

Glenshesk Tuff Formation

Computer Code: GKTU Preferred Map Code: GKTU
Status Code: Pending Upgrade
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: Interbedded purplish brown, grey, tuffaceous mudstone; pale grey, tuffaceous sandstone; green, vitric and lithic, coarse tuffs.
Definition of Lower Boundary: Lowest tuff layer resting on highest basalt lava flow of Carey River Basalt Formation.
Definition of Upper Boundary: Lowest coal seam (H) of the Murlough Bay Coals overlying mudstone.
Thickness: 61 m.
Geographical Limits: none recorded or not applicable
Parent Unit: Ballycastle Sandstone Group (BCSS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  North-east coast of County Antrim, south and east of Ballycastle and especially in Cross Borehole. 
Reference(s):
Wilson, H E and Robbie, J A. 1966. Geology of the Country around Ballycastle. Memoir of the Geological Survey. [Belfast: HMSO.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable