The subsequent Archean eon (approximately 3,500 million years ago) is known as the age of bacteria and archaea. The Proterozoic eon was the gathering up of oxygen in Earth's atmosphere ...

T he 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 ...