Computer Code: |
EMBL |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Ordovician Period (O)
— Ordovician Period (O) |
Lithological Description: |
Microdiorite, aphyric basalt, andesite and microgranodiorite. Radiometric age: 444 +/- 24 Ma (Rb-Sr whole rock) (Rundle, 1979). |
Definition of Lower Boundary: |
Not defined. |
Definition of Upper Boundary: |
Not defined. |
Thickness: |
Plugs and sheet-like masses emplaced into the Skiddaw Group. |
Geographical Limits: |
The area east of Cockermouth, Cumbria. |
Parent Unit: |
Lake District Ordovician Minor Intrusion Suite (LDOMI)
|
Previous Name(s): |
Embleton Diorite
(-888)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Close Quarry,Embleton. Eastwood et al (1968) Area. |
Reference(s): |
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. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. |
Eastwood, T, Hollingworth, S E, Rose, W C C, and Trotter, F M. 1968. Geology of the country around Cockermouth and Caldbeck. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 23. |
Rundle, C C, 1979. Ordovician intrusions in the English Lake District. Journal of the Geological Society of London, Vol.136, 29-38. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E023
E031
|