The BGS Lexicon of Named Rock Units — Result Details

Ravensholme Limestone Member

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 (-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):
Whittard, W F and Simpson, S (editors). 1960. Lower Carboniferous "in" Lexique Stratigraphique International, Part 3A VII, Vol.1, p.91. 
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. 
Brandon, A, Aitkenhead, N, Crofts, R G, Ellison, R A, Evans, D J and Riley, JN J, 1998. Geology of the country around Lancaster. Memoir of the British Geological Survey, Sheet 59 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E068 E059 E067