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

Abstract Otavi Group is a 1.5–3.5-km-thick epicontinental marine carbonate succession of
Neoproterozoic age, exposed in an 800-km-long Ediacaran− Cambrian fold belt that rims …

Geological evidence indicates that grounded ice sheets reached sea level at all latitudes
during two long-lived Cryogenian (58 and≥ 5 My) glaciations. Combined uranium-lead and …

The global biosphere is commonly assumed to have been less productive before the rise of
complex eukaryotic ecosystems than it is today. However, direct evidence for this assertion …

Major changes in atmospheric and ocean chemistry occurred in the Paleoproterozoic era
(2.5 to 1.6 billion years ago). Increasing oxidation dramatically changed Earth's surface, but …

It has been hypothesized that the overall size of—or efficiency of carbon export from—the
biosphere decreased at the end of the Great Oxidation Event (GOE)(ca. 2,400 to 2,050 Ma) …

Measurements of triple oxygen isotope ratios in barite horizons within post-Marinoan cap
carbonates have provided some of the most compelling evidence that the Marinoan …

We investigated the interactions between continental growth and breakup, inorganic
carbonate–silicate cycle, volcanic activity, glaciations, natural climate change, and biotic …

Geochemical analyses of sedimentary barites (barium sulfates) in the geological record
have yielded fundamental insights into the chemistry of the Archean environment and …

The beginning of the Ediacaran Period (∼ 635 Ma) is marked by conspicuous dolostone
units that cap Marinoan glacial deposits worldwide. The extent and sedimentary …