Eukaryotic life expanded during the Proterozoic eon 1, 2.5 to 0.542 billion years ago, against a background of fluctuating ocean chemistry 2,3,4.After about 1.8 billion years ago, the global ocean ...

Thomas Laakso, Andrew H. Knoll, and colleagues calculated the amount of phosphorus sedimentary rocks deposited toward the end of the Proterozoic Eon and early Phanerozoic Eon.

The first was the Neoproterozoic or the “great” oxygenation event which brought oxygen to Earth’s ... The search for animal fossils from the Proterozoic eon is hampered by uncertainty about ...

Advanced tools and expanded fossil datasets have painted a clearer picture of the eukaryotic diversity of the Proterozoic eon, which has been hard to quantify. The findings show that Earth's ...

The Proterozoic Eon, spanning from 2,500 million to 539 million years ago, marked a transformative chapter in Earth's history. Often overshadowed by the more data-rich Phanerozoic Eon, this period ...

Together, the data provides further evidence that Earth's oxygen increased in a stepwise fashion, as opposed to being constrained to two major events capping the Proterozoic (a geological epoch ...

With this new study, the chart of life now includes life forms from the Proterozoic Eon, 2,500 million to 539 million years ago. Proterozoic life was generally smaller and squishier ...

In 1998, Shuhai Xiao and colleagues reported finding thousands of 600 million year old embryo microfossils in the Neoproterozoic Doushantuo Formation, a fossil site near Weng'an, South China. But ...

More than an eon ago, the sun shone dimmer than it does today, but the Earth stayed warm due to a strong greenhouse gas effect, geoscience theory holds. Astronomer Carl Sagan coined this "the ...