The BGS Lexicon of Named Rock Units — Result Details

Peat Rig Formation

Computer Code: PERG Preferred Map Code: PERG
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Diverse porphyritic autobrecciated lavas, volcanic tuffs, breccias and agglomerates; hawaiite/mugearite in composition.
Definition of Lower Boundary: Presumed conformable base on Cat Cleugh Formation.
Definition of Upper Boundary: Faulted locally; otherwise top of the Bail Hill Volcanic Group, overlain conformably by Kirkcolm Formation.
Thickness: c.1000m
Geographical Limits: Bail Hill area, 4km north west of Sanquhar, Dumfries, Scotland.
Parent Unit: Bail Hill Volcanic Group (BAIL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Exposures around Bail Hill and along Grain Burn. 
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 Unpublished PhD thesis (University of St. Andrews). 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: