The BGS Lexicon of Named Rock Units — Result Details

Horton Formation

Computer Code: HNF Preferred Map Code: HnF
Status Code: Full
Age range: Gorstian Age (SG) — Gorstian Age (SG)
Lithological Description: Medium to dark grey laminated, micaceous and partly calcareous sandy siltstone containing carbonaceous debris. Near the base calcareous nodules occur in layers. Includes unit of turbiditic sandstone referred to as the Studfold Sandstone Member.
Definition of Lower Boundary: Taken at the sharp comformable base of a thick sequence of sandy siltstone overlying thickly bedded calcareous siltstone of the Arcow Formation.
Definition of Upper Boundary: Defined by the base of the overlying Neals Ing Formation.
Thickness: Up to 710m
Geographical Limits: Restricted to the Craven Inliers, North Yorkshire.
Parent Unit: Coniston Group (CTG)
Previous Name(s): Horton Flags [Obsolete Name And Code: See HNF] (HFL)
Coldwell Beds And Horton Flags [Obsolete Name And Code: See CDW And HNF] (CBHF)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Tongue Gill on the southern limb of the Studrigg-Studfold Syncline Arthurton et al, 1988 
Reference(s):
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). 
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. 
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