The BGS Lexicon of Named Rock Units — Result Details

Park End Breccia Formation

Computer Code: PKE Preferred Map Code: PKE
Status Code: Full
Age range: Cisuralian Epoch (PLC) — Cisuralian Epoch (PLC)
Lithological Description: Red breccio-conglomerate with rare thin silty sandstone lenses. Clasts are predominantly [90%] of "greywacke" sandstone of pebble to cobble size, the remainder are of mudstone, chert, basalt and various granitic and gabbroic coarse-grained igneous rocks. No serpentinite clasts are recorded, either in the primary survey by Peach and Horne in 1894 or in recent survey, which is in contrast to the publications of Pringle and Brookfield. The clasts are mostly subrounded to subangular, are contained in a siltstone or fine sandstone matrix and crudely imbricated indicating deposition from a palaeocurrent flowing towards the northwest.
Definition of Lower Boundary: Base of the Formation not seen but faulted against Lower Ordovician igneous rocks in Ballantrae harbour.
Definition of Upper Boundary: Upper boundary with the overlying Corseclays Sandstone Formation is concealed but inferred to be conformable.
Thickness: >250m
Geographical Limits: In the immediate vicinity of Ballantrae, Ayrshire, southwest Scotland.
Parent Unit: Stewartry Group (STEW)
Previous Name(s): Ballantrae Breccia Formation (-2977)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Ballentrae Harbour [NX 083 832]; about 50m of well-sorted, graded breccias are exposed just east of the harbour. Brookfield. 1978. 
Reference(s):
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. 
Brookfield, M E, 1978. Revision of the Stratigraphy of Permian and Supposed Permian Rocks of Southern Scotland. Geologische Rundschau, Vol.67, p.110-143. 
Pringle, J. 1935. British Regional Geology: the south of Scotland [1st edition]. [Edinburgh: HMSO.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S007