The BGS Lexicon of Named Rock Units — Result Details

Skiddaw Pluton

Computer Code: SKID Preferred Map Code: notEntered
Status Code: Full
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: Biotite granite and potassium feldspar-phyric biotite granite, with a zone of muscovite-quartz rock, interpreted as greisen. Radiometric age: 399 +/- 8 Ma (recalculated using later constants from Shepherd et al., 1976).
Definition of Lower Boundary: Not defined.
Definition of Upper Boundary: Not defined.
Thickness: A steep-sided cylindrical pluton, with an outcrop area less than 3 sq. km.
Geographical Limits: Grainskill Beck and the River Caldew [NY 298 300 to 326 331], and Sinen Gill [NY 229 281], Cumbria.
Parent Unit: Northern England Devonian Plutonic Suite (NEDP)
Previous Name(s): Skiddaw Granite (-3034)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  River Caldew, Cumbria. Loughlin (1999). 
Reference(s):
Loughlin, S C, 1999. Grainsgill, Caldew valley. In Stephenson, D, Bevins, R E, Millward D, Highton, A J, Parsons I, Stone P, and Wadsworth W J. Caledonian igneous rocks of the British Isles. (Peterborough: Joint Nature Conservation Committee.) 
Shepherd, T J, Beckinsale, R D, Rundle, C C and Durham J, 1976. Genesis of the Carrock Fell tungsten deposits, Cumbria: fluid inclusion and isotopic study. Transactions of the Institution of Mining and Metallurgy, Vol.85, B63-73. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E023 E029