The BGS Lexicon of Named Rock Units — Result Details

Dounreay Shore Formation

Computer Code: DRAY Preferred Map Code: notEntered
Status Code: Full
Age range: Eifelian Age (DI) — Givetian Age (DV)
Lithological Description: Siltstone dominated rhythmic cycles of interbedded siltstone, fine-grained sandstone, bituminous mudstone and calcareous laminite limestone.
Definition of Lower Boundary: Top of uppermost medium-grained cross-bedded sandstone of the underlying, sandstone dominated cyclic sequence, of the Sandside Bay Formation.
Definition of Upper Boundary: Base of lowest medium-grained sandstone of the overlying, sandstone dominated, cyclic sequence of the Crosskirk Bay Formation.
Thickness: 155m
Geographical Limits: On shore and immediately offshore of Dounreay area, Caithness, Northern Scotland.
Parent Unit: Caithness Flagstone Group (CNFL)
Previous Name(s): Dounreay Siltstone Member (DNSM)
Alternative Name(s): none recorded or not applicable
Type Section  Foreshore on the eastern side of Sandstone Bay c.500m north of the mouth of the Burn of Isauld [shown as the Achvarasdal Burn on OS 50k map] to Lower Dounreay [south eastern part of Dounreay Nuclear Establishment], Caithness. 
Fletcher, T P and Key, R M. 1991. Solid geology of the Dounreay District. British Geological Survey Technical Report WA/91/35C. 
British Geological Survey. (In preparation, to be published in 2005). Bedrock geology. Scotland Special Sheet (Dounreay).1:25 000. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable