COVER: Field photo of the Mesoarchean Keonjhar Paleosol, eastern India. The paleosol now occurs as a pale-colored thick horizon dominantly composed of pyrophyllite. It formed by intensive chemical weathering of a 3.29 Ga granite and is unconformably overlain by a succession of shallow-marine quartzarenite sandstones and interbedded conglomerates. The paleosol preserves chemical evidence for the oldest known example of oxidative weathering in a terrestrial environment. See “Oxygenation of the Archean atmosphere: New paleosol constraints from eastern India” by Mukhopadhyay et al., p. 923–926.