The BGS Lexicon of Named Rock Units — Result Details

Bennane Lea Breccia Member

Computer Code: BNL Preferred Map Code: Bnl
Status Code: Pending Upgrade
Age range: Permian Period (P) — Permian Period (P)
Lithological Description: Lithology. Pebbly sandstone of the Bennane Lea Member is present at the northern limit of the outcrop of the parent Corseclays Formation. At Bennane Lea the sandstone contains matrix-supported sub-angular clasts predominantly of altered basalt. The member is a lateral facies variant developed at the base of the formation where it unconformably overlies Lower Ordovician igneous rocks (Stone, 1988). It was previously informally referred to as the 'Bennane Lea Member' by Peach and Horne as part of the 1894 resurvey and it is noted by Stone (1988) that the Bennane Lea Member has erroneously been referred to an 'upper breccia division' (Jackson et al., 1995).
Definition of Lower Boundary: Highest exposed part of the Corseclays Sandstone Formation.
Definition of Upper Boundary: Highest exposed part of the Corseclays Sandstone Formation.
Thickness: c.20m
Geographical Limits: Known only at Bennane Lea, Ayrshire, southwest Scotland.
Parent Unit: Corseclays Sandstone Formation (CLY)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  On sheet S007, Girvan. 
Reference(s):
Jackson, D I et al. 1995. United Kingdom offshore regional report: the Geology of the Irish Sea (London: HMSO for the British Geological Survey). 
Stone, P. 1988. The Permian successions at Ballantrae and Loch Ryan, south-west Scotland. Report of the British Geological Survey, Vol.19, No.2, 13-18. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S007