Answer :
Periods, epochs, and ages are further broken into eons, which are themselves divided into eras. They are the Hadean, Archean, Proterozoic, and Phanerozoic eons, among others.
The Precambrian supereon is the combined name for the Hadean, Archean, and Proterozoic eons.
- Solar system creation in the Hadean eon;
- First microbes & poisonous atmosphere in the Archean eon
- First eukaryotes and the development of oxygen in the Proterozoic era
- The current epoch in earth's history during the Phanerozoic era
- Largest mass extinction in earth history occurred during the Paleozoic era.
- Dinosaur period during the Mesozoic era.
- Cenozoic period sometimes known as the "Age of Mammals".
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