“…This raises a fundamental problem. Either the Southern Uplands arc system had to exist prior to the Grampian Orogeny, and could not have been formed after post-Grampian subduction flip; or the stratigraphic and structural arguments for the position of the SUF in western Ireland, supported by ample geophysical evidence (Armstrong et al, 1998;Smith et al, 1997;O'Reilly et al, 1999), are incorrect. This study reinvestigates the field relationships of the SCG with a view to trying to resolve this problem.…”