The BGS Lexicon of Named Rock Units — Result Details

Spothfore Member

Computer Code: SPOT Preferred Map Code: SPOT
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Intrabasinal rudite.
Definition of Lower Boundary: At the base of the predominantly rudaceous beds containing intrabasinal clasts of greywacke, chert, black mudstone and volcanic rock, within the Kirkcolm Formation.
Definition of Upper Boundary: The top of the predominantly rudaceous beds, within the Kirkcolm Formation.
Thickness: 100-800m
Geographical Limits: North east of Bail Hill Volcanic Group, within the Kirkcolm Formation, north of Sanquhar, Dumfries, Scotland.
Parent Unit: Kirkcolm Formation (KKF)
Previous Name(s): Spothfore Formation (-3690)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Kiln Burn, 4.5km north west of Sanquhar 
Reference(s):
Hepworth, B C, Oliver, G J H and McMurtry, M J, 1982. Sedimentology, volcanism, structure and metamorphism of the northern margin of a Lower Paleozoic accretionary complex; Bail Hill - Abington area of the Southern Uplands of Scotland in: Leggett, J K (Editor).Trench-forearc geology: Sedimentation and Tectonics on modern and ancient active plate margins, p.521-534. Geological Society of London, Special Publication, No.10. 
Floyd, J D, 1996. Lithostratigraphy of the Ordovician rocks in the Southern Uplands: Crawford Group, Moffat Shale Group, Leadhills Supergroup. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.86, 153-165. 
McMurtry, M J, 1980. The Ordovician rocks of the Bail Hill area, Sanquhar, south Scotland. Volcanism and sedimentation in the Iapetus Ocean. Unpublished PhD thesis (University of St. Andrews). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S015 S015