Water plays a critical role in erosion and sediment transport and this relationship is most
evident in the hyperarid Atacama Desert of Northern Chile, a region characterized by …

Anoxic and iron-rich (ferruginous) conditions prevailed in the ocean under the low-oxygen
atmosphere that occurred through most of the Archean Eon. While euxinic conditions (ie …

Phosphorus is a limiting nutrient that is thought to control oceanic oxygen levels to a large
extent,–. A possible increase in marine phosphorus concentrations during the Ediacaran …

The rise of atmospheric oxygen during the Great Oxidation Event some 2.4 billion years ago
was a defining transition in the evolution of global biogeochemical cycles and life on Earth …

Expanded ocean anoxia and global cooling have been invoked as major causal
mechanisms for the Late Ordovician mass extinction, but the factors underpinning the …

The Emu Bay Shale (EBS) of South Australia is anomalous among Cambrian Lagerstätten
because it captures anatomical information that is rare in Burgess Shale–type fossils, and …

Pyrite, or iron disulfide, is the most common sulfide mineral on the Earth's surface and is
widespread through the geological record. Because sulfides are mainly produced by sulfate …

In one form or another, iron speciation has had a long history as a paleoredox proxy. The
technique has been refined considerably over the years, and the most recent scheme is …

The redox chemistry of anoxic continental margin settings evolved from widespread sulfide-
containing (euxinic) conditions to a global ferruginous (iron-containing) state in the early …

The formation of green rust (GR; a mixed ferric/ferrous hydroxide) and vivianite (ferrous
phosphate) are likely to have exerted a major control on phosphorus (P) cycling in ancient …