The BGS Lexicon of Named Rock Units — Result Details

Lower Bowland Shale Formation [Obsolete Name And Code: Part Of BSG]

Computer Code: LBS Preferred Map Code: LBS
Status Code: Index Level
Age range: Asbian Substage (CR) — Brigantian Substage (CX)
Lithological Description: Mudstone, dark grey to black, blocky or shaly, calcareous, pyritic, petroliferous, with subordinate interbedded limestones and sandstones. Limestones in the lower part especially include conglomerates and turbiditic debris beds.
Definition of Lower Boundary: Black mudstones at base of Formation show marked colour change from paler more variegated greys of Worston Shale Group accompanied by conspicuous reduction in bioturbation or where relatively fine-grained limestones of the Pendleside Limestone pass up into coarsely bioclastic limestones of Ravensholme Limestone.
Definition of Upper Boundary: Taken at the base of the Cravenoceras leion Marine Band.
Thickness: 55-400m.
Geographical Limits: Widespread in the Craven Basin , Lancaster, Garstang, Settle, Clitheroe and Harrogate districts.
Parent Unit: Not Entered (?)
Previous Name(s): Bowland Shale, Lower (-4146)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Little Mearley Clough, Pendle Hill, Lancashire (Earp and others 1961). 400m-950m upstream and to the south-east of Little Mearley Hall. 
Reference(s):
Earp, J R, Magraw, D, Poole, E G, Land, D H and Whiteman, A J, 1961. Geology of the country around Clitheroe and Nelson. Memoir of the Geological Survey of Great Britain, Sheet.68, England and Wales, pp.346. 
Parkinson, D, 1926. The faunal succession in the Carboniferous Limestone and Bowland Shales at Clitheroe and Pendle Hill, Lancashire. Quarterly Journal of the Geological Society of London. Volume 82. p.188-249. 
Parkinson, D, 1936. The Carboniferous succession in the Slaidburn district, Yorkshire. Quarterly Journal of the Geological Society of London. Volume 92. p.294-331. 
Bisat, W S, 1928. The Carboniferous goniatite zones of England and their continental equivalents "in" Compte Rendu Congres International de Stratigraphie et de Geologie du Carbonifere, Heerlen, p.117-133. 
Arthurton, R S, Johnson, E W and Mundy, D J C. 1988. Geology of the country around Settle. Memoir of the British Geological Survey, Sheet 60 (England and Wales). 
Aitkenhead, N, Bridge, D M, Riley, N J and Kimbell, S F. 1992. Geology of the country around Garstang. Memoir of the British Geological Survey, Sheet 67 (England and Wales) 
Booker, K M and Hudson, R G S, 1926. The Carboniferous sequence of the Craven Lowlands south of the reef limestones of Cracoe. Proceedings of the Yorkshire Geological Society, Vol.20, p.411-438. 
Phillips J, 1836. Illustrations of the Geology of Yorkshire, Part ii. The Mountain Limestone District. (London:John Murray). 
Ramsbottom, W H C, Calver, M A, Eagar, R M C, Hodson, F, Holliday, D W, Stubblefield, C J and Wilson, R B. 1978. A correlation of the Silesian rocks in the British Isles. Geological Society of London, Special Report No.10. 
Fewtrell, M D and Smith, D G, 1980. Revision of the Dinantian stratigraphy of the Craven Basin, N. England. Geological Magazine, Vol.117, p.37-49. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E067 E069 E060 E059