Here, we report Ce/Ce* data in marine carbonate rocks through 3.5 billion years of Earth's history, focusing in particular on the mid-Proterozoic Eon (i.e., 1.8 - 0.8 Ga). To better understand the ...

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 — like sea sponges ...

The simplified summary diagram shows the relative diversity of eukaryotic fossils throughout the Proterozoic Eon. Credit: Qing Tang / Shuhai Xiao / Virginia Tech Ice ages were a major reset button for ...

Roughly 2.5 billion years ago, Earth entered the Proterozoic Eon, the third of its four major geological eras, which lasted until 538 million years ago. By that time, life had already existed for at ...

A compilation of many different kinds of natural scientific investigations and their interrelations as well as their collective interpretation are necessary to understand past, presence and future of ...

This has been tried with somehow surprising results in this paper. Milky Way related cycles on Earth of 150 Myr duration as observed for the Phanerozoic Eon are obviously not dominant in the ...

Scientist Elizabeth Turner found fossilized evidence of 890-million-year-old sponges. These are possibly the earliest known evidence of animal life on Earth.

This research focuses on the Proterozoic Eon, the third of Earth’s four eons. It ranged from 2.5 billion years ago to 541 million years ago and spans two critical events in Earth’s history.

These organisms were significant as they used sunlight to make food—a process known as photosynthesis—and started producing oxygen as a waste product. Proterozoic Eon (2.5 billion – 541 million years ...

A new study by Virginia Tech geobiologists traces the cause of the first known mass extinction of animals to decreased global oxygen availability, leading to the loss of a majority of animals ...