The BGS Lexicon of Named Rock Units — Result Details

Auchensoul Bridge Mudstone Formation

Computer Code: AUB Preferred Map Code: AUB
Status Code: Full
Age range: Abereiddian Stage (O2) — Abereiddian Stage (O2)
Lithological Description: Reddish-grey and greenish-grey silty calcareous mudstones.
Definition of Lower Boundary: Conformably overlies Kirkland Conglomerate.
Definition of Upper Boundary: Conformably overlain by Stinchar Limestone, lateral equivalent of Auchensoul Limestone and perhaps Confinis Flags.
Thickness: 30 metres.
Geographical Limits: Not defined.
Parent Unit: Barr Group (BARR)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Auchensoul, Barr, Sheet S 008W. 
Ince, D, 1984. Sedimentation and tectonism in the Middle Ordovician of the Girvan district, north west Scotland. Transactions of the Royal Society of Edinburgh. Earth Sciences, Vol.75 (2), p.225-237. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: