Approximate Age - ohschools.k12.oh.us
Approximate Age. Distance (yards) Rocky Mountains are formed. 80 million years. First known fish. 510 million years. Paleozoic Era begins. Earliest humans. 2 million years. Formation of the Earth. 4.6 billion years. First known mammal. 200 million years. Proterozoic Eon begins. First single-celled organism. 1.2 billion years. Columbus discovers ... ................
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