The BGS Lexicon of Named Rock Units — Result Details
Upper Caithness Flagstone Subgroup
| Computer Code: | UCF | Preferred Map Code: | UCF |
|---|---|---|---|
| Status Code: | Pending Upgrade | ||
| Age range: | Givetian Age (DV) — Givetian Age (DV) | ||
| Lithological Description: | Laminated carbonate rich siltstones and shales with subordinate fine-grained, thinly bedded sandstones. | ||
| Definition of Lower Boundary: | Drawn at the base of the Achanarras Formation, where limestone rests conformably upon sandstone and shale of the Robbery Head Formation. | ||
| Definition of Upper Boundary: | Drawn at the conformable upward passage of lacustrine sandstone of the Mey Flagstone Formation to fluvial sandstone of the John O'Groats Sandstone Group. | ||
| Thickness: | c.1500m | ||
| Geographical Limits: | Northern Highlands of Scotland. | ||
| Parent Unit: | Caithness Flagstone Group (CNFL) | ||
| Previous Name(s): | Thurso Group [Obsolete Name and Code: Use UCF]
(-2513)
Upper Caithness Flagstone Formation (-584) Caithness Flagstone Series [Obsolete Name and Code: Use LCF, LSF, UCF, USF] (-4751) Upper Caithness Flagstone Group [Obsolete Name and Code: Use UCF] (-4380) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | The County of Caithness. | ||
| Reference(s): | |||
| Carruthers, R G, 1909. On the stratigraphic position of the Achanarras fauna in the Old Red Sandstone of Caithness. Summary of Progress of the Geological Survey of Great Britain for 1908. | |||
| Phemister, J. 1948. British Regional Geology: Scotland: the Northern Highlands (2nd edition) (Edinburgh: HSMO for the Geological Survey and Museum.) | |||
| Crampton, C B and Carruthers, R G, 1914. The geology of Caithness. Memoir of the Geological Survey, Scotland. Sheets 110 and 116 (Scotland). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S115 | |||