New age constraints for the Ordovician Tyrone Volcanic Group, Northern Ireland

Journal of the Geological Society, Jan 2008 by Cooper, M R, Crowley, Q G, Rushton, A W A

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Received 30 March 2007; revised typescript accepted 16 June 2007.

Scientific editing by Martin Whitehouse

M. R. COOPER1, Q. G. CROWLEY2 & A. W. A. RUSHTON3

1 Geological Survey of Northern Ireland, Colby House, Stranmillis Court, Mahne Lower, Belfast BT9 5BJ, UK

(e-mail: mark, cooper@detini.gov)

2 NERC Isotope Geoscience Laboratory, British Geological Survey, Kingsley Dunham Centre, Keyworth,

Nottingham NG12 5GG, UK

3 Palaeontological Department, The Natural History Museum, Cromwell Road, London SW7 5BD, UK