The BGS Lexicon of Named Rock Units — Result Details

Rain Gill Limestone Member

Computer Code: RNGL Preferred Map Code: RnGL
Status Code: Full
Age range: Arundian Substage (CJ) — Arundian Substage (CJ)
Lithological Description: Wackestones, floatstones and subordinate packstones, fine- to coarse-grained, cherty, muddy, dark-grey, thin- to thick-bedded, commonly with diffuse bed boundaries, interbedded with thin mudstones. Slumping is common.
Definition of Lower Boundary: Not seen at type locality. Upward passage of underlying laminated calcisiltites and mudstones of the Hodder Mudstone Formation (undifferentiated) into wackestones and floatstones of the Raingill Limestone Member.
Definition of Upper Boundary: Not seen at type locality. Passage of wackestones and floatstones of the Raingill Limestone Member into overlying laminated calcisiltites and mudstones of the Hodder Mudstone Formation (undifferentiated).
Thickness: To 170m
Geographical Limits: Restricted to the Ashnott [SD 69 48], Middop [SD 83 45], Slaidburn [SD 97 53] and Whitewell [SD 64 47] anticlines.
Parent Unit: Hodder Mudstone Formation (HOM)
Previous Name(s): Middop Limestone (MDPL)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  The best exposure in the Middop Anticline is in old quarry 0.5km eastsoutheast of Middop Hall. 
Type Section  In the Ashnott area the unit is exposed in Bonstone Brook, downstream from the track to Ashnott Farm, 1.75km south of Newton. 
Type Section  Quarry 0.45km southwest of Rain Gill, Slaidburn. The base and top of the unit are not exposed at this locality. 
Reference(s):
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). 
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. 
Riley N J. 1990. Stratigraphy of the Worston Shale Group (Dinantian) Craven Basin, north-west England. Proceedings of the Yorkshire Geological Society, Vol. 48, 163-187. 
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) 
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:
E059 E067