Abstract
Summary A combination of stratigraphic evidence and dates on igneous rocks suggests that the climax of Caledonian deformation in the British Isles and of Acadian deformation in the Canadian Appalachians both occurred during the middle to late Emsian stage, or about 397 to 390 Ma ago. In addition to this event, many small regions show uplift and/or deformation spasmodically throughout Silurian and Devonian time, both before and after the Emsian.
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