The BGS Lexicon of Named Rock Units — Result Details
Crosskirk Bay Formation
| Computer Code: | CKBA | Preferred Map Code: | notEntered |
|---|---|---|---|
| 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) |
||
| 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 | |||