The BGS Lexicon of Named Rock Units — Result Details

Roeburndale Member

Computer Code: RBL Preferred Map Code: Rbl
Status Code: Full
Age range: Arnsbergian Substage (CG) — Arnsbergian Substage (CG)
Lithological Description: Predominantly grey, sandy, micaceous, shaly siltstones with bunches of interbedded, generally fine-grained, sharp-soled sandstone lenses locally developed; includes three thin marine bands; rare clean quartzitic sandstones.
Definition of Lower Boundary: Base is top surface of the Brennand Grit, where present. This is typically a sandstone rootlet bed (ganister), overlain sharply by siltstone and fine-grained sandstone of the Roeburndale Member. Where the Brennand Grit is absent, gradational above the Pendle Grit Member, with boundary where siltstones of the Roeburndale Member become predominant above massive turbiditic sandstones of the Pendle Grit Member.
Definition of Upper Boundary: (nb previously defined at the base of the Caton Shale Formation).The base of the sandstone of the Ward's Stone Sandstone is typically sharp and erosional, and rests upon siltstones and fine-grained sandstones of the Roeburndale Member.
Thickness: c.600-700m
Geographical Limits: Lancaster, Garstang and Settle, 1:50,000 sheets.
Parent Unit: Silsden Formation (SILS)
Previous Name(s): Roeburndale Grit Group (-481)
Roeburndale Grit [Obsolete Name And Code: RBL] (RBG)
Lower Roeburndale Grit [Obsolete Name And Code: See RBL] (LRBG)
Roeburndale Formation (-4285)
Upper Roeburndale Grit [Obsolete Name And Code: See RBL] (NRBG)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Snab Beck, Aughton. Section commences 600m upstream from The Snab. 
Reference Section  Discontinuous section including the E. ferrimontanum Marine Band, Sapling Clough Sandstone, E. yatesae Marine Band and upper boundary. 230m upstream of confluence of Sapling Clough and Round Hill Water. 
Type Area  Lancaster Fells 
Reference(s):
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) 
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). 
Moseley, F, 1954. The Namurian of the Lancaster Fells. Quarterly Journal of the Geological Society of London, Vol.109, 423-454. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E060 E067 E059