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4540 BCE
Earth is formed
Dust that had been floating around in space begain to collect together. Because these particles have gravity the collection of dust grew and grew until it formed our earth. -
3800 BCE
First forms of life
RNA molecules are the first signs of life and are able to self replicate in nature. -
3500 BCE
1st Multicellular Life
The fist example of multicellular organisms is cyanobacteria. Though this is the first example of a multicellular organism, multicellular organisms have evolved independent of each other at least 46 times. -
2500 BCE
Oxygen enters atmosphere
Cyanobacteria started production oxygen and over millions of years the buildup of oxygen in the atmosphere made the earth more sustainable. -
2100 BCE
1st Eukaryotes
The earliest know eukaryotes are acritarchs. These are also the most common fossils of the late Proterozoic. -
439 BCE
End Ordovician Extinction
About 85% of all marine life went extinct. The two main causes of this are the cooling of the earth and lowering of the sea level. -
367 BCE
Late Devonian Extinction
Around 75% of all life died. The lack of oxygen in the sea resulted in almost all marine life dieing and reefs did not recover until almost 100 million years later. -
270 BCE
Pangaea forms
Pangaea was a supercontinent that was surrounded by the ocean Panthalassa. This supercontinent spanned the early Permian period until the early Jurassic period. -
245 BCE
End Permian Extinction
Almost all marine life died and 70% of terrestrial vertebrates died. It is the only mass extinction of insects know to have happened. -
208 BCE
End Triassic Extinction
This wiped out nearly half of all life. The possible reasons for this is either climate change or an impact. -
200 BCE
Pangaea Begains to Break Apart
Because of the constant movement of tectonic plates the supercontinent Pangaea begain to break apart 200 million years ago. -
65 BCE
End Cretaceous
This extinction killed the dinosaurs. It is thought to be caused by a meteor impact which led to climate change.
