The BGS Lexicon of Named Rock Units — Result Details

Llandrygarn Gneiss Package

Computer Code: COEDL Preferred Map Code: notEntered
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Biotite, sillimanite and garnet-bearing pelitic, semipelitic and quartzo-feldspathic gneiss. Mafic gneiss occurs locally as pods within the quartzo-feldspathic gneiss.
Definition of Lower Boundary: Tectonic or intrusive with the Coedana granite (COEDG).
Definition of Upper Boundary: Unconformably overlain by Ediacaran Llyn Maelog Group (LMG) and younger, Ordovician rocks.
Thickness: none recorded or not applicable
Geographical Limits: Anglesey.
Parent Unit: Mona Gneiss Suite (NMG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable