3200-2800 Ma
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§ Mesoarchean Era
It is believed that early in this period of Earth's history, it was completely covered by ocean. It was only through volcanic eruptions that continents were formed. Seventy percent of the continental landmasses date from this period.
Fossil evidence tells us that around 3000 Ma (3 billion years ago) single celled organisms had evolved, some solitary and some that formed colonies such as cyanobacteria (blue-green algae). It would form large mats, called stromatolites.
§ Sources
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