"Evidence is adduced to relate the published minimum absolute date of --475 m.y., for the metamorphism of the Connemara schists, to its correct position in the lower Palaeozoic stratigraphy of western Ireland. The metamorphism pre-dates the Didymograptus extensus zone of the Arenig in Connemara and south Mayo and an upper Cambrian or Tremadocian age is considered likely."

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