The BGS Lexicon of Named Rock Units — Result Details

Borrowdale Volcanic Group
Computer Code: BVG Preferred Map Code: BVG
Status Code: Full
Age range: Caradoc Epoch (O4) — Caradoc Epoch (O4)
Lithological Description: Medium to high-k, continental margin calc-alkaline basalt-andesite-rhyolite volcanic association of lavas, sills, pyroclastic and reworked pyroclastic deposits. NOTE: See definitions of component formations and members.
Definition of Lower Boundary: Unconformably overlies the Skiddaw Group; the base is taken at this unconformity where there is a profound change from a marine mudrock sequence to a volcanic one.
Definition of Upper Boundary: Unconformably overlain by Windermere Supergroup.
Thickness: Variable, but probably up to 6000m.
Geographical Limits: Central Lake District, also in Cross Fell Inlier and possibly Teesdale Inlier.
Parent Unit: Not Applicable (-)
Previous Name(s): Borrowdale Volcanic Series (-3883)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Central Lake District, but see stratotypes for component formations and members. 
Reference(s):
Moseley, F, 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. 
Millward, D, 2003. A stratigraphical framework for the Lower Palaeozoic igneous rocks of the Lake District and adjacent areas. British Geological Survey Research Report, RR/03/?? 
Millward D, et al. 2000. Geology of the Ambleside district. Memoir of the British Geological Survey, Sheet 38 (England and Wales). 
Johnson, E W, Soper, N J and Burgess, I C, 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, Sheet 48. 
Akhurst, M C, Chadwick, R A, Holliday, D W, McCormac, M, McMillan, A A, Millward, D, Young, B, Ambrose, K, Auton, C A, Barclay, W J, Barnes, R P, Beddoe-Stephens, B, James, J C W, Johnson, H, Jones, N S, Glover, B W, Hawkins, M P, Kimbell, G S, MacPherson, K A T, Merritt, J W, Milodowski, A E, Riley, N J, Robins, N S, Stone, P and Wingfield, R T R. 1997. The geology of the west Cumbria district. Memoir of the British Geological Survey, Sheets 28, 37 and 47 (England and Wales). 138pp. 
Burgess, I C and Holliday, D W. 1979. Geology of the country around Brough-under-Stainmore. Memoir for 1:50 000 geological sheet 31 and parts of sheets 25 and 30. Geological Survey of Great Britain (England and Wales). [London: HMSO.] 131pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E025 E031 E039 E028 E030 E038 E047 E037 E029 E024 E048
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