2.1 - 2.04
2.04 - 1.98
1.98 - 1.92
1.92 - 1.86
1.86 - 1.8
300M
2.1 - 1.8
60M
9th Galactic year 2.25 - 2
8th Galactic year 2 - 1.75
Proterozoic Eon 2.5 - 540 M
Precambrian Time 4.5 - 543 M