The BGS Lexicon of Named Rock Units — Result Details

Selcoth Formation

Computer Code: SEO Preferred Map Code: SEO
Status Code: Full
Age range: Llandovery Epoch (SL) — Llandovery Epoch (SL)
Lithological Description: Sandstone, typically fine- to medium-grained but ranging from very fine- to coarse-grained. Generally medium- to thick-bedded over thicknesses of tens of metres interspersed with units up to few metres very thin to thin-bedded. Interbedded siltstone or silty mudstone generally in thin beds; sandstone and siltstone typically greenish grey when fresh, pale brown weathering. The Selcoth Formation is of broadly similar character to the Glendearg Formation, although it lacks the very thick-bedded parallel laminated sandstone units typical of the latter and has a very restricted age range in comparison.
Definition of Lower Boundary: Conformable sedimentary boundary with rocks of the Moffat Shale Group.
Definition of Upper Boundary: Faulted, no stratigraphical contact preserved.
Thickness: Few hundred metres to 2000m
Geographical Limits: Southern Scotland.
Parent Unit: Ettrick Group (ETRK)
Previous Name(s): Queensbury Formation (-4033)
Queensbury Grits (-4034)
Alternative Name(s): none recorded or not applicable
Reference Section  Bodesbeck Burn, Moffatdale, northeast of Moffat. Webb et al, 1993 
Type Section  Silcoth Burn, Moffatdale, northeast of Moffat. Webb et al, 1993. 
British Geological Survey. 1991. Moffatdale. Solid Geology. 1:25 000. Classical areas of British geology. (Keyworth, Nottingham: British Geological Survey). 
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. 
Webb, B C, Rushton, A W A and White, D E. 1993. Moffatdale and the upper Ettrick valley. Description of the solid geology of parts of 1:25000 sheets NT10, 11, 20 and 21. Classical Areas of British Geology. (London: British Geological Survey, HMSO.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable