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The early Paleozoic rocks of eastern Ireland span the suture zone between the Laurentian and Ganderian continental margins of the Iapetus Ocean. The Grangegeeth Terrane comprises a Laurentian continental fragment and Ordovician volcanic arc that formed the southern margin of the late Ordovician Rathkenny Basin of Moffat Shale facies mudstone. Together, these were overstepped in Wenlock time by Laurentia-derived greywackes and became the southernmost tract of the Longford–Down Terrane accretionary prism as subduction brought them into the Laurentian-margin trench. South of the suture, Middle Ordovician failed rifting of a Ganderian volcanic arc terrane was followed by shortening during continuing...

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