Oceanic sulfate concentrations are widely thought to have reached millimolar levels during the Proterozoic Eon, 2.5 to 0.54 billion years ago. Yet the magnitude of the increase in seawater sulfate ...

Geological records suggest that marine phytoplankton might have arisen in the Proterozoic while zooplankton remained absent, and marine productivity was not excessively low. However, quantitative ...

Oxygen levels in the atmosphere during the mid-Proterozoic—about 1.4 billion years ago—were higher than previously thought, according to an international team of researchers who looked at oxygen ...

"This project grew from a Pardee keynote symposium ('Neoproterozoic geobiology : fossils, clocks, isotopes, and rocks') held at the 2003 Geological Society of America annual meeting in Seattle"--Pref.

The Proterozoic Eon, spanning from 2,500 million to 539 million years ago, marked a transformative chapter in Earth's history ...

The Proterozoic is a Precambrian eon of geologic time extending from about 2.5 billion to 541 million years ago, bounded by the Archean–Proterozoic and Proterozoic–Phanerozoic transitions. It is ...