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: | Rotliegend Group (RLG) | ||
| Previous Name(s): | Basal Breccia [Obsolete Name and Code: Use PBB]
(-4831)
Basal Permian Breccia [Obsolete Name And Code: See PBB] (BPB) |
||
| 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): | |||
| 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. | |||
| 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). | |||
| 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). | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E032 E113 E101 E100 E088 E112 E126 | |||