The BGS Lexicon of Named Rock Units — Result Details
Crosskirk Bay Formation
Computer Code: | CKBA | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Givetian Age (DV) — Givetian Age (DV) | ||
Lithological Description: | Sandstone-dominated rhythmic cycles of interbedded sandstone, siltstone and calcareous laminite limestone. | ||
Definition of Lower Boundary: | Base of lowest medium-grained sandstone unit overlying siltstone-dominated cyclic sequence of the Dounreay Shore Formation. | ||
Definition of Upper Boundary: | Highest unit in local stratigraphy. Top not seen. | ||
Thickness: | More than 290m | ||
Geographical Limits: | Onshore and immediately offshore of the Dounreay area, Caithness, Northern Scotland. | ||
Parent Unit: | Caithness Flagstone Group (CNFL) | ||
Previous Name(s): | Achreamie Sandstone Formation [Obsolete Name and Code: Use CKBA]
(-3301)
Crosskirk Flagstone Formation [Obsolete Name and Code: Use CKBA] (-3302) Buldoo Flagstone Formation [Obsolete Name and Code: Use CKBA] (-1432) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Partial Type Section | Brims Ness coastal section, c. 7.5 km northwest of Thurso, northeast Caithness, Highland Region. | ||
Partial Type Section | Coastal section from Lower Dounreay (southeast end of Dounreay Nuclear Establishment) to Crosskirk Bay, northeast Caithness. | ||
Reference(s): | |||
British Geological Survey. (In preparation, to be published in 2005). Bedrock geology. Scotland Special Sheet (Dounreay).1:25 000. | |||
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: | |||
none recorded or not applicable |