The BGS Lexicon of Named Rock Units — Result Details

Dungeon Ghyll Sandstone Member

Computer Code: DGY Preferred Map Code: Dgy
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Volcaniclastic siltstone, sandstone and breccia characterised by widespread syndepositional deformation and slumping such that bedding, particularly in the finer lithologies, is rarely preserved
Definition of Lower Boundary: Taken at the base of dominantly disrupted units overlying volcaniclastic rocks of the Three Tarns, Cam Crags and Harrison Stickle members
Definition of Upper Boundary: Defined by the base of overlyig pyroclastic rocks of the Pavey Ark Breccia Member
Thickness: Up to 60m
Geographical Limits: Scafell Pike to the Langdale Pikes, and from Seathwaite Fell (Borrowdale) to Thirlmere, Cumbria
Parent Unit: Seathwaite Fell Sandstone Formation (SET)
Previous Name(s): Dungeon Ghyll Member (-4604)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Langdale Pikes, Cumbria Kneller and McConnell, 1993 
Reference(s):
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. 
Kneller B C and McConnell, B J . 1993. The Seathwaite Fell Formation in the central Fells. British Geological Survey Technical Report WA/93/43 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable