The BGS Lexicon of Named Rock Units — Result Details

Caithness Flagstone Group

Computer Code: CNFL Preferred Map Code: notEntered
Status Code: Full
Age range: Eifelian Age (DI) — Eifelian Age (DI)
Lithological Description: Flagstone, rhythmic mudstone-limestone, siltstone, sandstone units. NOTE: See component formations for Type Sections.
Definition of Lower Boundary: Top of red bed sandstones of Yesnaby Sandstone Group in Orkney and of Sarclet Group in Caithness.
Definition of Upper Boundary: Base of yellowish brown sandstones of the Orkney Sandstone Group .
Thickness: + 2000m.
Geographical Limits: Orcadian Basin - Shetland to Moray Firth, Northern Scotland.
Parent Unit: Old Red Sandstone Supergroup (ORS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S109 S109 S110 S115 S115 S116 S116 S117 S117 S119 S119 S120 S121 S122