The BGS Lexicon of Named Rock Units — Result Details

Austwick Formation

Computer Code: AUF Preferred Map Code: AuF
Status Code: Full
Age range: Sheinwoodian Age (SS) — Homerian Age (SH)
Lithological Description: Parallel bedded turbiditic sandstones separated by laminated siltstone. Laminated argillaceous siltstone up to 80m thick at base contain an abundant graptolite fauna indicative of the Sheinwoodian Stage of the Wenlock.
Definition of Lower Boundary: Taken at the base of carbonaceous siltstones that are overlain by turbiditic sandstones. Oversteps Crummack Formation and Ashgill strata to overlie the Ingleton Group.
Definition of Upper Boundary: Defined by the base of the overlying Arcow Formation.
Thickness: Up to 600m
Geographical Limits: Restricted to the Craven Inliers, North Yorkshire.
Parent Unit: Tranearth Group (TNTH)
Previous Name(s): Austwick Flags And Grits [Obsolete Name And Code: Use AUF] (AFG)
Moughton Whetstones [Obsolete Name And Code: Part Of AUF] (MWH)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Crummack Dale, about 2km north of Austwick McCabe, 1972 
Reference(s):
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. 
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. 
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). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E050 E060