| Computer Code: |
RL |
Preferred Map Code: |
RL |
| Status Code: |
Full |
| Age range: |
Asbian Substage (CR)
— Brigantian Substage (CX) |
| Lithological Description: |
Coarsely bioclastic, shelly and crinoidal limestones, conglomeratic in places, with subordinate shaly mudstone beds and partings. |
| Definition of Lower Boundary: |
The limestone of the Ravensholme Limestone Member either conformably overlies dark mudstones of the Bowland Shale Formation (undifferentiated) or rests directly on the relatively fine-grained limestones of the Pendleside Limestone Formation. |
| Definition of Upper Boundary: |
Top is overlain conformably by the predominantly mudstone sequence of the Bowland Shale Formation (undifferentiated). |
| Thickness: |
To c.35m |
| Geographical Limits: |
Occurs at scattered localities in the Craven Basin, including the northern slopes of Pendle Hill [SD 81 43] and the Brennand Inlier [SD 65 54]. |
| Parent Unit: |
Bowland Shale Formation (BSG)
|
| Previous Name(s): |
Ravensholme Limestone [Obsolete Name and Code: Use RL]
(-1142)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Possible type section in a stream section at Red Syke, Pendle Hill, Lancs. 1/4 mile east of Ravens Holme: the member shows its maximum measured development of 114ft (34.7m). Clitheroe Memoir, p.77. |
| Reference(s): |
| Brandon, A, Aitkenhead, N, Crofts, R G, Ellison, R A, Evans, D J, and Riley, N J. 1998. Geology of the country around Lancaster. Memoir of the British Geological Survey, Sheet 59 (England and Wales). |
| 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. |
| Whittard, W F and Simpson, S (editors). 1960. Lower Carboniferous "in" Lexique Stratigraphique International, Part 3A VII, Vol.1, p.91. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E068
E059
E067
|
