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4600 million years ago
Gravity slowly gathered this gas and dust together into clumps that became asteroids and small early planets. -
3,500 million years ago, more complex forms of life took longer to evolve.
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2,450 million years ago, oxygen was becoming a significant component of earths atmosphere.
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2,100 million years ago, some of the earliest known single called eukaryotes fossils are acritatchs.
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1,800 million years ago, the first Homo sapiens were on earth.
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1,300 million years ago, earths initial life forms were bacteria, which could survive in the highly toxic atmosphere that existed during this time.
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270 million years ago, all the continents were together.
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200 million years ago, Pangea begins to break apart.
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-Ordovician
-Late Devonian
-Permian Mass
-Triassic
-Cretaceous
