History of the Earth and Evolution

Events

Formation of the solar system- 4.6 billion years ago

4600000000 bc

Formation of the Earth- 4.5 billion years ago

4500000000 bc

Oldest known cellular fossils- 3.5 billion years old

3500000000 bc

Age of microfossils resembling cyanobacteria found in Australia- 2.7 billion years old

2700000000 bc

Oxygen reached today's levels- 2.2 billion years ago

2200000000 bc

Prokaryotes entered and began to live in larger prokaryotes- 1.5 billion years ago

1500000000 bc