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*Eons and Eras


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Precambrian
Supereon divided in the eons Hadean, Archean and Proterozoic. Ends with the first explosion of life forms.
Hadean
The Rockless eon. Earth forms, earth crust solidifies, heavy bombardment with asteroids.
Archean
Abiogenesis, unicellular organisms, bacteria, free oxygen, Ur supercontinent.
Proterozoic
Multicellular life, invertebrates, sponges, oxygenated atmosphere, Huronian glaciation, Rodinia and Pannotia continents.
Phanerozoic
The eon we live in. Divided in the three eras Paleozoic, Mesozoic and Cenozoic.
Paleozoic
Divided in the six periods Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
Mesozoic
The Age of Reptiles. Divided in the three periods Triassic, Jurassic and Cretaceous.
Cenozoic
The Age of Mammals and the era we live in. Subdivided in the three periods Paleogene, Neogene and Quaternary.