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3,200 to 2,800 million years ago
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4 to 2.5 billion years ago. Earliest traces of life found in the Archean era. Limited to oceans and single-celled. Used other elements than oxygen to survive.
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4.5 to 4 billion years ago. Earth and the Moon was formed. No record of life.
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2,000 to 2,500 million years ago.
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Just before proliferation of complex life on Earth
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1,600 to 1,000 million years ago and the first period of Earth's history of which a fairly definitive geological record survives.
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1,00o to 541 million years ago and is the last era of the Precambrian Supereon and the Proterozoic Eon; it is subdivided into the Tonian, Cryogenian, and Ediacaran Periods.
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541 to 485 million years ago. Lineage of living animals diversified and moss grew on land with association to fungi
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419 to 200 million years ago. Organisms start to move to land and there were massive environmental changes
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200 to 66 million years ago. Dinosaurs became the largest land herbivores and predators. Mammals were small and nocturnal. Then mass extinction.
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66 million years ago to present. Mammals replaced dinosaurs, great spread of grasslands, ice ages, humans emerged, and modern day.
