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Journal of the Geological Society; 1992; v. 149; issue.1; p. 3-6;
DOI: 10.1144/gsjgs.149.1.0003
© 1992 Geological Society of London

Article

The Ordovician biogeography of the Grangegeeth terrane and the Iapetus suture zone in eastern Ireland

A. W. OWEN1, D. A. T. HARPER2 & M. ROMANO3

1 Department of Geology & Applied Geology, University of Glasgow, Glasgow G12 8QQ, UK
2 Department of Geology, University College, Galway, Ireland
3 Earth Sciences Unit, University of Sheffield, Beaumont Building, Brookhill, Sheffield S3 7HF, UK

The Caradoc trilobite and brachiopod faunas of the Grangegeeth terrane show marked Scoto–Appalachian/Laurentian affinities. Contrary to some plate tectonic models, this indicates that the terrane must lie to the north of the Iapetus suture. More limited graptolite evidence from the Llanvirn of Grangegeeth suggests that the terrane may have been closer to the Gondwanan margin or at least at higher latitudes earlier in the Ordovician and migrated to low latitudes prior to its eventual accretion onto the Laurentian margin.





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