The BGS Lexicon of Named Rock Units — Result Details

Arcow Formation

Computer Code: ARF Preferred Map Code: ArF
Status Code: Full
Age range: Homerian Age (SH) — Gorstian Age (SG)
Lithological Description: Medium to pale grey mottled, dominantly calcareous, extensively bioturbated, thickly bedded, "unstriped" siltstone with thin siltstone laminations.
Definition of Lower Boundary: Taken at the sharp base of thickly bedded calcareous siltstones overlying laminated siltstones of the Austwick Formation.
Definition of Upper Boundary: Defined by the base of the overlying Horton Formation.
Thickness: Generally about 10m; but locally up to 35m
Geographical Limits: Restricted to the Craven inliers, North Yorkshire
Parent Unit: Tranearth Group (TNTH)
Previous Name(s): Austwick Flags & Grits (King And Wilcockson, 1934) (-653)
Austwick Flags And Grits [Obsolete Name And Code: Use AUF] (AFG)
Alternative Name(s): none recorded or not applicable
Type Section  Arcow Wood Quarry, about 4 km NE of Austwick McCabe, 1972 
McCabe, P J. 1972. The Wenlock and Lower Ludlow strata of the Austwick and Horton-in-Ribblesdale Inlier of north west Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.39, 167-174. 
Kneller, B C, Scott R W, Soper N J, Johnson E W and Allen P M, 1994. Lithostratigraphy of the Windermere Supergroup, Northern England. Geological Journal, Vol. 29, 219-240. 
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). 
King, W B R and Wilcockson, W H, 1934. The Lower Palaeozoic rocks of Austwick and Horton-in-Ribblesdale, Yorkshire. Quarterly Journal of the Geological Society of London, Vol.90, 7-31. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: