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Geological Society, London, Special Publications; 1988; v. 38; p. 111-122;
DOI: 10.1144/GSL.SP.1988.038.01.08
© 1988 Geological Society of London

Pre-Arenig Activity in the Caledonian-Appalachian Orogen

Early deformation in the Caledonian-Appalachian orogen

Nicholas Rast, B. A. Sturt & A. L. Harris

Department of Geological Sciences, University of Kentucky, Lexington, KY 40506, USA
Department of Geology, University of Bergen, Bergen, Norway
Department of Geological Sciences, University of Liverpool, Liverpool L69 3BX, UK

Deformation isotopically dated at 1100–1000 Ma has been recorded in the Moine rocks of N Scotland and may be related to the latest stages of Grenville orogenesis of N America. Late Precambrian orogenesis is widely recorded in the dispersed fragments of Avalonia particularly in the eastern Appalachians, eastern Newfoundland and southern Britain. Localized evidence for late Cambrian-early Ordovician orogenesis is forthcoming in the Appalachians (Penobscot) in Scandinavia (Finnmarkian) and in Scotland and Ireland (Grampian).