The BGS Lexicon of Named Rock Units — Result Details

Benan Conglomerate Formation

Computer Code: BNC Preferred Map Code: BNC
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Boulder conglomerate.
Definition of Lower Boundary: Locally erosive contact with Stinchar Limestone Formation, basal beds are laterally equivalent to the Superstes Mudstone Formation.
Definition of Upper Boundary: Overlain by Balclatchie Formation.
Thickness: 50-750m
Geographical Limits: North side of the Stinchar Valley, Girvan district. Lower part is lateral equivalent of Superstes Mudstone Formation.
Parent Unit: Barr Group (BARR)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Benan Hill, Kirkland Hill, Auchensoul Hill. 
Reference(s):
Lapworth, C, 1882. The Girvan Succession. Quarterly Journal of the Geological Society of London, Vol. 38, 537-666. 
Williams, A, 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. Memoir of the Geological Society of London, No.3. 
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:
S008 S007