The BGS Lexicon of Named Rock Units — Result Details

Hanging Stone Tuff

Computer Code: HNG Preferred Map Code: Hng
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Cream and brown-weathered, bedded, fine-grained tuff with accretionary lapilli that forms a widespread distinctive marker unit at the top of the Long Top Tuff Member.
Definition of Lower Boundary: Taken at the base of bedded silicic tuff overlying eutaxitic lapilli-tuff of the Long Top Tuff Member, and lying between 25 and 75m above the base of the member or 5-15m above the top of the Oxendale Tuff where this is present
Definition of Upper Boundary: Defined by the overlying eutaxitic lapilli-tuff of the Crinkle Tuff Member
Thickness: Up to 3m, but is typically less than 1m
Geographical Limits: Cumbria, Thirlmere to Scafell and Langdale in the central Lake District
Parent Unit: Long Top Tuff Member (LTT)
Previous Name(s): Hanging Stone Tuff Member (-3475)
Alternative Name(s): none recorded or not applicable
Reference Section  Base Brown, southwest of Seathwaite in Borrowdale, Cumbria Branney et al., 1993 
Branney, M J, Davis, N C, Kokalaar, B P and McConnell, B J. 1993. The Airy's Bridge Formation in the central Fells. British Geological Survey Technical Report WA/93/41 
Millward, D, Johnson, E W, Beddoe-Stephens, B, Young, B, Kneller, B C, Lee, M K, Fortey, N J, Allen, P M, Branney, M J, Cooper, D C, Hirons, S, Kokelaar, B P, Marks, R J, McConnell, B J, Merritt, J W, Molyneux, S G, Petterson, M G, Roberts, B, Rundle, C C, Rushton, A W A, Scott, R W, Soper, N J and Stone, P. 2000. Geology of the Ambleside district. Memoir of the British Geological Survey, England and Wales, Sheet 38. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable