The BGS Lexicon of Named Rock Units — Result Details

Glynllifon Trachydacite

Computer Code: GLTD Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Porphyritic trachydacite, with sodic andesine phenocrysts, glomeroporphyritic clots and mafic pseudomorphs, apetite and zircon in a weakly flow foliated microcrystalline groundmass.
Definition of Lower Boundary: none recorded or not applicable
Definition of Upper Boundary: none recorded or not applicable
Thickness: About 350m
Geographical Limits: none recorded or not applicable
Parent Unit: Carn Fadryn Suite (CAFA)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Young, T P, Gibbons, W and McCarroll, D. 2002. Geology of the country around Pwllheli. Memoir of the British Geological Survey, Sheet 134 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E134