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
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. 
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: