Answers are grounded in this paper and cite their sources.
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.
No takes yet. Share an insight, caveat, or question.
Dewey et al. (1970) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: