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Precambrian Eon
4.6 - 541 M 4.059
Proterozoic Eon
2.5 - 541 M 2,047,000,000
Paleoproterozoic Era
2.5 - 1.6 900,000,000
Orosirian Period
2.05 - 1.8 2.05
| 2 Average age of Contenental Crust |
| 2.0 - 1.7 .3 Baltica collide. |
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Precambrian Eon
4.6 - 541 M 4.059
Proterozoic Eon
2.5 - 541 M 2,047,000,000
Paleoproterozoic Era
2.5 - 1.6 900,000,000
Orosirian Period
2.05 - 1.8 2.05
| 1.85 - .85 1 Stage 3 O2 starts to gas out of the oceans, but is absorbed by land surfaces and formation of ozone layer. |
| 1.85 - 0 protist Eukaryotes |
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