The BGS Lexicon of Named Rock Units — Result Details

John O'Groats Sandstone Formation

Computer Code: JOG Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Givetian Age (DV) — Givetian Age (DV)
Lithological Description: Red sandstones, with sporadic bands of flagstone, thin impure limestone and shale.
Definition of Lower Boundary: Drawn at the base of thin impure sandstone of the John O'Groats Sandstone Formation where it rests unconformably upon thin limestones of the Upper Caithness Flagstone Subgroup.
Definition of Upper Boundary: The red sandstone of this Formation is not overlain.
Thickness: c.609m
Geographical Limits: Caithness, Northern Highlands, Scotland, Grampian Region.
Parent Unit: Eday Group (EDY)
Previous Name(s): John O'Groats Sandstone Group (-983)
John O'Groats Sandstone And Flagstone Group (-4112)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  John O'Groat's House, Caithness, on the shore. 
Reference(s):
Crampton, C B and Carruthers, R G, 1914. The geology of Caithness. Memoir of the Geological Survey, Scotland. Sheets 110 and 116 (Scotland). 
House, M R, Richardson, J B, Chaloner, W G, Allen, J R L, Holland, C H and Westoll, T S. 1977. A Correlation of Devonian rocks of the British Isles. Geological Society of London, Special Report No.8, Scottish Academic Press, Edinburgh. 
Geikie, A, 1879. On the Old Red Sandstone of Western Europe. Transactions of the Royal Society of Edinburgh, Vol.28, p.374-404. 
Phemister, J. 1948. British Regional Geology: Scotland: the Northern Highlands (2nd edition) (Edinburgh: HSMO for the Geological Survey and Museum.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S116 S115