The BGS Lexicon of Named Rock Units — Result Details

High Haume Tuff Formation

Computer Code: HHR Preferred Map Code: HHR
Status Code: Full
Age range: Rawtheyan Stage (OW) — Rawtheyan Stage (OW)
Lithological Description: Welded rhyolitic tuff.
Definition of Lower Boundary: Probable non-sequence: at base of rhyolitic tuff, above calcareous silty mudstone of the Broughton Moor Formation or, where this is absent, the Kirkley Bank Formation.
Definition of Upper Boundary: Probably conformable, at top of rhyolitic tuff and base of overlying silty mudstone or calcareous mudstone of the Ashgill Formation.
Thickness: c.25m
Geographical Limits: Low Furness, Ordovician inlier, south Cumbria. Correlatives occur elsewhere within the Windermere Supergroup outcrop of Northern England.
Parent Unit: Dent Group (DNT)
Previous Name(s): High Haume Rhyolite (-4705)
High Haume Volcanic Formation (-1594)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Outcrop near High Haume Farm, north east of Dalton in Furness, Cumbria. 
Type Area  Along the crest of High Haume ridge, near High Haume Farm 
Reference(s):
Soper, N J, 1994. The Lower Palaeozoic rocks of 1:10,000 sheets SD28SW, SD27NW and SD27NE, Low Furness, Cumbria, British Geological Survey Technical Report WA/94/61. 
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. 
Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. 
Rose, W C C. 1977. Geology and Hematite deposits of South Cumbria. Economic Memoir for 1:50,000 Sheet 58 and southern part of Sheet 48. Memoir of the geological Survey of Great Britain. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E048