The sulfur biogeochemical cycle integrates the metabolic activity of multiple microbial
pathways (eg, sulfate reduction, disproportionation, and sulfide oxidation) along with abiotic …

The oxygen content of the Earth's surface environment is thought to have increased in two
broad steps: the Great Oxygenation Event (GOE) around the Archean–Proterozoic boundary …

Long-term secular variation in seawater sulfate concentrations ([SO 4 2−] SW) is of interest
owing to its relationship to the oxygenation history of Earth's surface environment. In this …

The deep-water Avalon biota (about 579 to 565 million years old) is often regarded as the
earliest-known fossil assemblage with macroscopic and morphologically complex life forms …

Abstract The Proterozoic Eon spans Earth's middle age during which many important
transitions occurred. These transitions include the oxygenation of the atmosphere …

Understanding variation in the sulfur isotopic composition of sedimentary pyrite (δ34Spyr) is
motivated by the key role of sulfur biogeochemistry in regulating Earth's surface oxidation …

The sulfur biogeochemical cycle plays a key role in regulating Earth's surface redox through
diverse abiotic and biological reactions that have distinctive stable isotopic fractionations. As …

A hypothesized rise in oxygen levels in the Neoproterozoic, dubbed the Neoproterozoic
Oxygenation Event, has been repeatedly linked to the origin and rise of animal life …

The first appearance of skeletal metazoans in the late Ediacaran (∼ 550 million years ago;
Ma) has been linked to the widespread development of oxygenated oceanic conditions, but …

The Ediacaran System and Period was ratified in 2004, the first period-level addition to the
geologic time scale in more than a century. The GSSP at the base of the Ediacaran marks …