The BGS Lexicon of Named Rock Units — Result Details

Ward's Stone Sandstone

Computer Code: WRST Preferred Map Code: WrSt
Status Code: Full
Age range: Arnsbergian Substage (CG) — Arnsbergian Substage (CG)
Lithological Description: Feldspathic to quartzose, coarse-grained to fine-grained sandstones, commonly with ganisters; typically fines upwards; several thin coal seams in upper part.
Definition of Lower Boundary: Sharp, generally erosional, base on siltstones of the Roeburndale Member.
Definition of Upper Boundary: Sharp upper boundary at base of dark grey mudstone of the Caton Shale.
Thickness: c.15 - 200m; typically c.15 - 30m; unusually thick in Ward's Stone area.
Geographical Limits: Lancaster Fells. Mapped but unnamed on Settle (60) and Garstang (67) sheets where included in top of Roeburndale Member (then termed Formation).
Parent Unit: Silsden Formation (SILS)
Previous Name(s): Caton Coal Grit (-3769)
Ward's Stone Sandstone Formation (-3030)
Roeburndale Grit [Obsolete Name And Code: RBL] (RBG)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Snab Beck, Aughton. Complete section, including upper and lower boundaries, commences 300m upstream of Snab House. 
Reference Section  Raven Scar, Artle Beck, Caton. Complete section in crag exposure above Artle Beck, 500m southsoutheast of Ravenscar Farm. 
Type Section  Wray Borehole (SD66NW/5) Ward's Stone Sandstone Formation between 120.45 - 42.95m depth. 
Reference(s):
Slinger, F C, 1936. Millstone Grit and glacial geology of Caton Moor near Lancaster. Report of the British Association for the Advancement of Science, Blackpool 1936, 345. 
Moseley, F, 1954. The Namurian of the Lancaster Fells. Quarterly Journal of the Geological Society of London, Vol.109, 423-454. 
Moseley, F, 1956. The geology of the Keasden area, west of Settle, Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.30, 331-352. 
Brandon, A. 1992. The geology of the Caton area. British Geological Survey Technical Report, WA/92/17. 
Tiddeman, R H, 1891. Horizontal section, Sheet 147. Illustration of the geology of Slaidburn and Ingleton. Geological Survey of England and Wales. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E059