The BGS Lexicon of Named Rock Units — Result Details

Permian Basal Breccia

Computer Code: PBB Preferred Map Code: PBB
Status Code: Full
Age range: Permian Period (P) — Permian Period (P)
Lithological Description: Conglomerate, matrix supported; matrix of grey-brown, dolomitic or calcareous sandstone with rounded to angular grey, green, purple or red clasts of mudstone, sandstone, ironstone, limestone and less common igneous and metamorphic rocks.
Definition of Lower Boundary: Sharp; unconformable on reddened Carboniferous rocks.
Definition of Upper Boundary: Sharp; upward passage into late Permian mudstones (Marl Slate), dolostone or dolomitic siltstone (Cadeby Formation) or sandstone (Lenton Sandstone Formation).
Thickness: Generally less than 2m
Geographical Limits: Eastern and north-east England, patchily distributed (Smith, 1989, fig.3). Associated with aeolian sandstone in Yorkshire.
Parent Unit: Rotliegendes Group (RLG)
Previous Name(s): Basal Permian Breccia [Obsolete Name And Code: See PBB] (BPB)
Basal Breccia (-4831)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Kimberley railway cutting surface section. Described in Frost and Smart (1979). 
Type Area  Nottinghamshire/Derbyshire concealed coalfield. Numerous shaft and borehole sections described by Edwards (1951), Edwards (1967), Smith et al (1973), Frost and Smart (1979). 
Reference(s):
Mills, D A C. and Hull, J H. 1976. Geology of the country around Barnard Castle. Memoir of the Geological Survey of Great Britain. HMSO. 385pp. 
Smith, D B and Francis, E A. 1967. Geology of the country between Durham and West Hartlepool. Memoir of the Geological Survey of Great Britain, Sheet 27 (England and Wales). 
Edwards, W N, 1967. Geology of the country around Ollerton (2nd edition). Memoir of the Geological Survey of Great Britain, sheet 113 (England and Wales). 
Smith, E G, Rhys, G H and Goossens, R F. 1973. Geology of the country around East Retford. Memoir of the Geological Survey of Great Britain, Sheet 101 (England and Wales). 
Edwards, W, 1951. The concealed coalfield of Yorkshire and Nottinghamshire (3rd edition). Memoir of the Geological Survey of Greta Britain. 
Frost, D V and Smart, J G O, 1979. Geology of the country around Derby. Memoir of the Geological Survey of Great Britain, Sheet 125 (England and Wales). 
Smith, D B. 1989. The late Permian palaeogeography of north-east England. Proceedings of the Yorkshire Geological Society, Vol.47, 285-312. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E032 E113 E101 E100 E088 E112 E126