The BGS Lexicon of Named Rock Units — Result Details

Tang Sandstone Member

Computer Code: TANG Preferred Map Code: TANG
Status Code: Full
Age range: Eifelian Age (DI) — Eifelian Age (DI)
Lithological Description: Alternating quartzose, medium-grained sandstone units less than 1m thick with greenish siltstone interbeds; minor grey silty mudstone (not laminated) with fossil fish (Millerosteus minor).
Definition of Lower Boundary: Conformable on the uppermost dolomitic laminite-limestone of the Brims Castle Dolomitic Limestone Member.
Definition of Upper Boundary: Conformable beneath Port of Brims Sandstone Member at the base of the first thick (>4m), cross-bedded sandstone unit.
Thickness: 100m
Geographical Limits: Onshore and immediate offshore of Dounreay area, Caithness, Northern Scotland.
Parent Unit: Mey Flagstone Formation (MEY)
Previous Name(s): Tang Sandstone Formation (-463)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Coastal section east of Brims Castle, to the east of the Tang headland (c.7.5km northwest of Thurso, Caithness). Fletcher and Key, 1991. 
Reference(s):
British Geological Survey. (In preparation, to be published in 2005). Bedrock geology. Scotland Special Sheet (Dounreay).1:25 000. 
Donovan, R N, Foster, R J and Westoll, T S, 1974. A stratigraphical revision of the Old Red Sandstone of north-eastern Caithness. Transactions of the Royal Society of Edinburgh, Vol.69, p.167-201. 
Fletcher, T P and Key, R M. 1991. Solid geology of the Dounreay District. British Geological Survey Technical Report WA/91/35C. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S115