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Geologic Time Scale. Era Time Period World Events LIFE Nick-name Pre- Cambrian From 4.6 Billon YBP until 570 Million YBP "Shield" Regions of the world.
Geologic Time Scale. Era Time Period World Events LIFE Nick-name Pre- Cambrian From 4.6 Billon YBP until 570 Million YBP "Shield" Regions of the world.
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