The age of the South Connemara Group, Ireland, and its relationship to the Southern Uplands Zone of Scotland and Ireland

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Abstract
Synopsis: The South Connemara Group lies to the south of the Dalradian rocks of Connemara. It consists of approximately 3 km of interbedded pillow lavas, cherts, sandstones and conglomerates with significant amphibolite intrusives. Hitherto its age has been unknown although it has been contact metamorphosed by the Devonian Galway Granite. New palaeontological evidence suggests an early Ordovician age for the sequence. The petrofacies of the clastic units within the group, its structural style, age and tectonic position suggest similarities with parts of the Southern Uplands of Scotland and its equivalents in Ireland. The South Connemara Group bears greatest similarities to Tract 2 of the Southern Uplands. The age of the group supports the apparent SW to NE diachronism of clastic sedimentation in this part of the Caledonides. The proposed correlation imposes a constraint on the position of the Southern Upland Fault in Ireland.

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