Timeline: life history in earth | Timetoast

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3800 BCE

Archean era

http://www.bbc.co.uk/nature/history_of_the_earth/Archean
850 BCE

Cryogenian period

http://www.bbc.co.uk/nature/history_of_the_earth/Cryogenian
635 BCE

Ediacaran period

http://www.bbc.co.uk/nature/history_of_the_earth/Ediacaran
545 BCE

Cambrian period

http://www.bbc.co.uk/nature/history_of_the_earth/Cambrian
495 BCE

Ordovician period

http://www.bbc.co.uk/nature/history_of_the_earth/Ordovician