| Computer Code: |
LYIN |
Preferred Map Code: |
notEntered |
| Status Code: |
Full, without ratification |
| Age range: |
Eocene Epoch (GE)
— Eocene Epoch (GE) |
| Lithological Description: |
Medium- to coarse-grained biotite-muscovite granite, with either large single/twinned perthitic orthoclase crystals, albite-oligoclase, interstitial quartz and quartz-feldspar intergrowths (type G1) or large phenocrysts of feldspar and smaller phenocrysts (up to 4 mm across) of bipyramidal quartz, plates of intergrown biotite and muscovite with perthite and albite (type G2). The memoir also records the presence of bodies of syenite and a suite of basic dykes. |
| Definition of Lower Boundary: |
Not known. |
| Definition of Upper Boundary: |
Not known. |
| Thickness: |
Not known. |
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Lundy Island, off the N Devon coast. Dollar, 1942. |
| Reference(s): |
| Edmonds, E A, Williams, B J and Taylor, R T. 1979. Geology of Bideford and Lundy Island. Memoir of the Geological Survey of Great Britain, Sheets 292 with 275, 276, 291, and part of 308 (England and Wales). |
| Dollar, A T J. 1942. The Lundy Complex: its petrology and tectonics. Quarterly Journal of the Geological Society London. Vol. 97, pp 465-499. |
| Hall, T C. 1915. Note on a unique orthophyre of Lundy which he proposed to call 'lundyite'. P 53 in Summary of Progress of Geological Survey of Great Britain for 1914. |
| Judd, J W. 1874. The Secondary Rocks of Scotland. Second Paper. On the ancient volcanoes of the Highlands and the relations of their products to the Mesozoic strata. Quarterly Journal of the Geological Society London, Vol. 30, pp 220-302. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
