“…In addition to the large dataset of zircon ages from the Grampian and Northern Highlands terranes compiled by Oliver et al (2008), we include the following data sets; a) additional ages from the Northern Highlands terrane given by Goodenough et al (2011) and Kocks et al 2014, b) an age from the Lorn Lavas in the Grampian Terrane from Neilson et al (2009), c) recently acquired zircon ages from the Trans-Suture granites (Miles et al, 2014), and d) ages of plutons from the extension of each terrane into Ireland (from Chew & Stillman, (Parslow and Randall, 1973;Rollin, 1984;Emenike, 1986;Kimbell et al, 2010). Furthermore, a number of these gravity studies suggest that most plutons are steep-sided.…”