The BGS Lexicon of Named Rock Units — Result Details

Lake District Ordovician Minor Intrusion Suite

Computer Code: LDOMI Preferred Map Code: notEntered
Status Code: Full
Age range: Ordovician Period (O) — Ordovician Period (O)
Lithological Description: Basalt, dolerite and gabbro; dacite, garnetiferous dacite, rhyolite; andesite and hybridised andesite; intrusive breccia; microdiorite; porphyritic horneblende diorite and microdiorite; hornblendite.
Definition of Lower Boundary: Dykes, plugs and other minor intrusions in the Lake District of known and inferred Ordovician age, including two formal lithodemic units, the Embleton microdiorite intrusions (EMBL) and the Bassenthwaite diorite intrusions (BADIN).
Definition of Upper Boundary: Not defined.
Thickness: Not defined.
Geographical Limits: Cumbria, within the the Lake District and Cross Fell Lower Palaeozoic inliers.
Parent Unit: Caledonian Supersuite (CIGSS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Millward, D. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. 
Macdonald, R, Millward, D, Beddoe-Stephens, B and Laybourn-Parry, J. 1988. The role of tholeiitic magmatism in the English Lake District: evidence from dykes in Eskdale. Mineralogical Magazine, Vol. 52, p. 459-472. 
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. 
Fortey, N J, Cooper, A H, Henney, P J, Colman,T and Nancarrow, P H A. 1994. Appinitic intrusions in the English Lake District. Mineralogy and Petrology, Vol. 51, p. 355-375. 
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:
E023 E029 E048 E031 E037 E038 E047 E039 E028