The long history of life on Earth has unfolded as a cause-and-effect relationship with the
evolving amount of oxygen (O2) in the oceans and atmosphere. Oxygen deficiency …

Estimates for animal antiquity exhibit a significant disconnect between those from molecular
clocks, which indicate crown animals evolved∼ 800 million years ago (Ma), and those from …

Natural hydrogen seeps called fairy circles have been identified in Mali, Brazil, Russia, and
United-States. Natural hydrogen is produced from a field in Mali for 7 years. The natural …

The Ediacaran Period (635 to 541 Ma) marks the global transition to a more productive
biosphere, evidenced by increased availability of food and oxidants, the appearance of …

Fossilized carotenoid hydrocarbons provide a window into the physiology and biochemistry
of ancient microbial phototrophic communities for which only a sparse and incomplete fossil …

Abstract The Ediacaran Period (∼ 635 to 541 Ma) witnessed the early diversification and
radiation of metazoans, in the form of the Ediacaran Biota. This biological revolution …

Abstract Throughout the Proterozoic Era, sedimentary organic carbon burial helped set the
pace of global oxygenation and acted as a major modulator of atmospheric CO 2 and …

Calcium is an essential element in the biogeochemical cycles that regulate the long-term
climate state of Earth. The removal of CO 2 from the ocean-atmosphere system is controlled …

The higher abundance of dolomite in the Neoproterozoic compared with that of the
Phanerozoic has been linked to elevated marine Mg/Ca ratios, and a hypothesized 'dolomite …

Compared with Phanerozoic strata, sulfate minerals are relatively rare in the Precambrian
record; this is probably due to the lower concentrations of sulfate in dominantly anoxic …