Cover Image Credits: Images, clockwise from top left: felsic gneiss bands within garnet amphibolites of the Nuvvuagittuq supracrustal belt, northern Québec, Canada (photograph from Darling and others, p. 844, this issue); snapshot of mixing in the mantle after 10 Myr under a stagnant lid regime (photograph from O'Neill and others, p. 912, this issue); the stability fields of iron and copper oxides and respective carbonates as a function of f_O2 and f_CO2 based on thermodynamic data for aqueous species (diagram from Hazen, p. 807, this issue); Raman spectroscopy (blue-green images) of zircon from Dallwitz Nunatak and Gage Ridge (images from Martina Menneken, see Kusisk and others, p. 933, this issue) and ion image maps showing U and Pb distribution (yellow-red images) in a zircon from Mount Sones (images from Monika Kusiak, see Kusiak and others, p. 933, this issue), all from the Napier Complex, Antarctica; timeline showing the evolution of the Itsaq Gneiss Complex, West Greenland, from 3.6 to 3.9 Ga (diagram from Nutman and others, p. 877, this issue).