GEOLOGIC TIME SCALE
GEOLOGIC TIME SCALE. PRECAMBRIAN ERA. 5,000 – 544 MYA. The beginnings of life, approximately 1,200 MYA. Single and multiple celled organisms-lived in water. Cyanobacteria. prokaryote, no nucleus. PALEOZOIC ERA. 544 - 245 MYA. The evolution of life in the sea and on land.
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