Redox-sensitive trace metals have been used extensively as geochemical proxies to infer
the redox-status of marine sediments at the time of their deposition, and by extension, the …

The accumulation of oxygen is one of the most important characteristics that distinguish
Earth from other planets in the solar system, which is also considered to be the key factor …

Eukaryotic life appears to have flourished surprisingly late in the history of our planet. This
view is based on the low diversity of diagnostic eukaryotic fossils in marine sediments of mid …

The mid-Proterozoic, spanning 1.8 to 0.8 billion years ago, is recognized as a phase of
marine anoxia, low marine primary productivity (MPP), and constrained eukaryotic …

Abstract The Mesoproterozoic era (1,600–1,000 million years ago (Ma)) has long been
considered a period of relative environmental stasis, with persistently low levels of …

The history of atmospheric oxygen through the Mesoproterozoic Era is uncertain, but may
have played a role in the timing of major evolutionary developments among eukaryotes …

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 …

Variations in atmosphere oxygen and ocean sulfate concentrations through time are
regarded as important controls on the cycles of sediment-hosted and volcanic-hosted ore …

The Ulvophyceae, a major group of green algae, is of particular evolutionary interest
because of its remarkable morphological and ecological diversity. Its phylogenetic …

Abstract The overmature Precambrian to Lower Paleozoic marine shales from China contain
relatively simple organic matter (OM) composition, which is dominated by in-source solid …