The BGS Lexicon of Named Rock Units — Result Details

Coedana Complex

Computer Code: COED Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Migmatitic pelites and semi-pelites, calc-silicate gneisses, amphibolites and granite, with hornfelsed aureole.
Definition of Lower Boundary: Unknown.
Definition of Upper Boundary: Unknown.
Thickness: Unknown.
Geographical Limits: Anglesey Special 1:50 000 Geological Sheet, but unit probably extends offshore. Comprises a belt of rocks that extends NE-SW across central Anglesey, but is also found in thrust slices in NW Anglesey, and in inliers surrounded by younger strata. Lateral boundaries unknown; certainly faulted in part, but with igneous contacts and metamorphic gradients also.
Parent Unit: Not Available (!)
Previous Name(s): Coedana Granite (COEDG)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Gwalchmai Quarry, 1km northwest of Gwalchmai village. Horak, J M (in Carney et al, 2000) 
Type Area  Central Anglesey, between Llysdulas and Llanfaelog, and Carmel Head. Greenly, 1919. 
Reference Section  Maen-Gwyn Farm, 1.9km south southwest of Llanerchyinedd. Exposures in farmyard and around immediate vicinity. Horak, J J. (In Carney et al, 2000). 
Reference(s):
Gibbons, W, Tietzch-Tyler, D, Horak, J M and Murphy, F C. 1994. Precambrian rocks in Anglesey, southwest Llyn and southeast Ireland. 75-84. 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. 
Gibbons, W and Horak, J. 1990. Contrasting metamorphic terranes in northwest Wales. 315-327 in D'Lemos, R S, Strachan, R A and Topley, C G (editors),The Cadomian Orogeny. Geological Society of London Special Publication No.51. 
Greenly E. 1919. The geology of Anglesey, Vol 1. Memoir of the Geological Survey of Great Britain (England and Wales). (London: H.M.S.O.). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E094 E093 E105