The BGS Lexicon of Named Rock Units — Result Details

Lake District Ordovician Felsic Plutonic Suite

Computer Code: LDFP Preferred Map Code: notEntered
Status Code: Full
Age range: Ordovician Period (O) — Ordovician Period (O)
Lithological Description: Granite,microgranite (Eskdale and Ennerdale intrusions), granodiorite and microgranodiorite (Eskdale intrusions); garnet-bearing quartz-feldspar-phyric microgranite (Threlkeld Intrusion); dolerite,diorite and hybridised rocks (Ennerdale Intrusion). These all have Ordovician radiometric ages (see Millward, 2000, for summary and references).
Definition of Lower Boundary: Not defined.
Definition of Upper Boundary: Not defined.
Thickness: To include all felsic plutonic intrusions in the Lake District and adjacent areas of proved and inferred Ordovician age which includes the exposed Threlkeld (THKD), Ennerdale (ENIN) and Eskdale (ESK) intrusions, and the concealed Wensleydale Intrusion (Kirby et al, 2000).
Geographical Limits: Within the Lake District Lower Palaeozoic inlier in Cumbria, and concealed beneath the Askrigg Block.
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, 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. 
Millward, D. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. 
Stephenson, D, Bevins, R E, Millward, D, Highton, A J, Parsons, I, Stone, P and Wadsworth, W J, 1999. Caledonian igneous rocks of the British Isles. (Peterborough: Joint Nature Conservation Committee.) 
Kirby,G A, Baily, H A, Chadwick, R A, Evans, D J, Holliday, D W, Holloway, S. Hulbert, A G, Pharaoh, T C, Smith, N J P, Aitkenhead, N, and Birch, B. 2000.The structure and evolution of the Craven Basin and adjacent areas. Subsurface Memoir of the British Geological Survey. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E037 E038 E029 E028 E048 E047