Abstract
Synopsis During Ordovician times, at least 36 000 feet of sediments accumulated in the South Mayo Trough, which lay to the north of a rising cordillera of Dalradian metamorphic rocks in Connemara, western Ireland. A complex faulted relationship existed between trough and cordillera. K-Ar isotopic ages, showing a spread within the range 475 to 420 m.y., are interpreted as representing the time during which the cordillera was progressively uplifted, eroded, and cooled.
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