| Computer Code: |
LBS |
Preferred Map Code: |
LBS |
| Status Code: |
Index Level |
| Age range: |
Asbian Substage (CR)
— Brigantian Substage (CX) |
| Lithological Description: |
[Obsolete: use BSG] 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: |
none recorded or not applicable
|
| Previous Name(s): |
Bowland Shale, Lower [Obsolete Name and Code: Use LBS]
(-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. 117-133 in Compte Rendu Congres International de Stratigraphie et de Geologie du Carbonifere, Heerlen. |
| 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, 411-438. |
| 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. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E067
E069
E060
E059
|
