The geological history of the earth is studied by dividing it in aeons, then further dividing aeons into eras, an era in periods, a period in epochs.

Life appeared in the Archaeozoic aeon. Multicellular life appeared during Proterozoic aeon. Currently, it is Phanerozoic aeon, that started about 540 million years ago.

The Phanerozoic aeon is divided into three eras: Palaeozoic, Mesozoic and... more

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