The BGS Lexicon of Named Rock Units — Result Details
Twt Hill Granite Pluton
| Computer Code: | TWTH | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
| Lithological Description: | Homogeneous pale grey micro-syenogranite. | ||
| Definition of Lower Boundary: | none recorded or not applicable | ||
| Definition of Upper Boundary: | none recorded or not applicable | ||
| Thickness: | none recorded or not applicable | ||
| Geographical Limits: | Crags and quarries around Twt Hill, Caernarfon, North West Wales [248301 363138]. The outcrop as mapped extends to the NE as a fault bounded unit. | ||
| Parent Unit: | Not Entered (?) | ||
| Previous Name(s): | Arvonian Formation [Obsolete Name and Code: Use ARN, TWTH]
(-4435)
Twt Hill Granite Pluton (TWTH) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| none recorded or not applicable | |||
| Reference(s): | |||
| Schofield, D.I., Evans, J.A., Millar, I.L., Wilby, P.R. and Aspden, J.A. 2008. New U-Pb and Rb-Sr constraints on pre-Arcadian tectonism in North Wales. Journal of the Geological Society. 165, 5 891-894. | |||
| Greenly, E. 1944. The Arvonian rocks of Arvon. Quarterly Journal of the Geological Society, London, 100, 269-287. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E106 E118 | |||