The BGS Lexicon of Named Rock Units — Result Details
Johnston Intrusive Complex
| Computer Code: | JOIN | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Index Level | ||
| Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
| Lithological Description: | Intrusions of quartz diorite, tonalite, granite,and pegmatite, with some hybrid rock types. | ||
| Definition of Lower Boundary: | Not applicable; contacts mostly faulted. | ||
| Definition of Upper Boundary: | Not applicable. | ||
| Thickness: | Unknown. | ||
| Geographical Limits: | Southwest Wales, Pembrokeshire. | ||
| Parent Unit: | Not Available (!) | ||
| Previous Name(s): | Johnston Complex
(-984)
Johnston Diorite Complex (-985) Johnston Series (-986) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Johnston railway cutting Strahan et al., 1914 | ||
| Reference(s): | |||
| Strahan A, Cantrill T C, Dixon E E L, Thomas H H, and Jones O T. 1914. The geology of the South Wales Coalfield, Part XI. The country around Haverfordwest. Memoir of the Geological Survey of Great Britain. (London: HMSO). 262pp. | |||
| Bevins, R E, Pharaoh, T C, Cope, J C W, and Brewer, T S. 1985. Geochemical character of Neoproterozoic volcanic rocks in southwest Wales. Geological Magazine, Vol. 132, 339-349. | |||
| Pharaoh T C and Gibbons W. 1994. Precambrian rocks in England and Wales south of the Menai Strait Fault System. 85-97 in Gibbons W and Harris A L (editors), A revised correlation of Precambrian rocks in the British Isles. Geological Society of London Special Report No.22. | |||
| Baker, J W. 1982. The Precambrian of south-west Dyfed. 15-25 in Geological Exclusions in Dyfed, South-west Wales. Bassett, M G (editor). (Cardiff: National Museum of Wales.) | |||
| Thorpe, R S. 1972. Possible subduction zone origin for two Precambrian calc-alkaline plutonic complexes from southern Britain. Bulletin of the Geological Society of America, Vol. 83, 3663-3668. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E227 E228 | |||