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
Stratotypes:
Reference Section  Bodesbeck Burn, Moffatdale, northeast of Moffat. Webb et al, 1993 
Type Section  Silcoth Burn, Moffatdale, northeast of Moffat. Webb et al, 1993. 
Reference(s):
British Geological Survey. 1991. Moffatdale. Solid Geology. 1:25 000. Classical areas of British geology. (Keyworth, Nottingham: British Geological Survey). 
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.) 
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable