2.7 - 2.64
2.64 - 2.58
2.58 - 2.52
2.52 - 2.46
2.46 - 2.4
300M
2.7 - 2.4
60M
11th Galactic year 2.75 - 2.5
10th Galactic year 2.5 - 2.25
Archean Eon 3.9 - 2.5 archeaon
Proterozoic Eon 2.5 - 540 M proterozoic eon
Precambrian Time 4.5 - 543 M precambrian