The BGS Lexicon of Named Rock Units — Result Details

Black Isle Sandstone Group

Computer Code: BKI Preferred Map Code: BkI
Status Code: Full
Age range: Mid Devonian Epoch (DM) — Mid Devonian Epoch (DM)
Lithological Description: Red sandstone sequence incorporating the Den Siltstone, Kilmuir Conglomerate and Raddery Sandstone Formations.
Definition of Lower Boundary: Unconformable base of Old Red Sandstone sequence.
Definition of Upper Boundary: Unconformable base of the Balnagown Sandstone Group.
Thickness: + 2000m.
Geographical Limits: Easter Ross-shire , Scotland.
Parent Unit: Old Red Sandstone Supergroup (ORS)
Previous Name(s): Middle Old Red Sandstone (-62)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Area to north-west of Great Glen Fault. Black Isle Easter Ross-shire. 
Reference(s):
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S084 S094 S094 S093