The BGS Lexicon of Named Rock Units — Result Details

Gwalchmai Formation

Computer Code: GWALC Preferred Map Code: notEntered
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Metasandstone, contact metamorphosed.
Definition of Lower Boundary: Unconformably overlying Llandrygarn Gneiss package (COEDL) - but in large parts intrusive contact with Coedana Granite (COEDG).
Definition of Upper Boundary: Stratigraphic contact with overlying Mynydd Bonafon Formation (BONA).
Thickness: none recorded or not applicable
Geographical Limits: Anglesey.
Parent Unit: Llynn Maelog Group (LMG)
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