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 ...

The Proterozoic Eon is also called the Cryptozoic ("age of hidden life"). About 2.5 billion years ago, enough shield rock had formed to start recognizable geologic processes such as plate tectonics.

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 ...

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 ...

But the new model shows oxygen levels there may have been unreliable during the mid to late Proterozoic Eon. Rob the rich. Earliest metazoans, the term for multicellular beings that are animals, ...

No 'boring billion' The study focused on the middle of the Proterozoic Eon, over a billion years ago. The proliferation of complex life was still a few hundred million years out, and the pace of ...

image: Earliest animals evolved in the mid to late Proterozoic Eon and lie deep in the fossil record. view more Credit: Douglas Erwin / National Museum of Natural History ...

Right between those active mountain-forming eras, crustal thickness plummeted through the Proterozoic eon (2.5 billion to 0.5 billion years ago), reaching a low during Earth's "middle age." ...

In a 2021 study, scientists tried to reconstruct the oxygen levels on Earth more than 2 billion years ago during the Proterozoic Eon. This time period, ...