[4] The Dresser Formation is located in the Pilbara Craton, and contains sedimentary rock from the Paleoarchean Era.

Such microbial mats belong to the oldest ascertained life form and may include fossilized bacteria.

[2] The Strelley Pool Chert, also located in the Pilbara Craton, contains stromatolites that may have been created by bacteria 3.4 billion years ago.

It was created around 3.26 Ga when a large asteroid, about 37 to 58 kilometres (23–36 mi) wide, collided with the Earth.

[9] Due to a much hotter mantle and an elevated oceanic geothermal gradient compared to the present day, plate tectonics in its modern form did not exist during the Paleoarchean.