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):
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. 
Moseley, F, 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. 
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:
E038 E047 E037 E029 E024 E048 E025 E031 E039 E028 E030
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