Abstract
SUMMARYThe lithological and structural characteristics of the metamorphosed Pre-Cambrian rocks of Wales and Leinster are reviewed, and the Dutch Gin Schists are not accepted as a stratigraphical unit. The Bray Series, Cullenstown Group, Ballycogly Group and Bedded Succession of North Wales are regarded as parts of a single Monian System which accumulated in a Caledonoid trough and was involved in a late Pre-Cambrian orogeny. The latter also affected the pre-Monian basement, parts of which (possibly unrelated to one another) are seen in the gneisses of Co. Wexford (Rosslare Complex), Lleyn and Anglesey.
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