The BGS Lexicon of Named Rock Units — Result Details

Arcow Formation [Obsolete: use CDW]

Stratotypes:
Computer Code:	ARF	Preferred Map Code:	ArF
Status Code:	Full
Age range:	Homerian Age (SH) — Gorstian Age (SG)
Lithological Description:	[Obsolete: use CDW] 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:	none recorded or not applicable
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
Reference(s):
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:
E050

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