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The end of the last few Era's have been marked by mass extinctions.
- Cenozoic Era(65.5Ma to Now) - Current Era
- Mesozoic Era(251 to 65.5Ma) - Cretaceous/Tertiary Extinction Event.
- Paleozoic Era(542 to 251Ma) - Permian/Triassic Extinction Event (Great Dying)
- Neoproterzoic Era(1000 to 542Ma) - Mass extinctions of many of the 1st multi celled animals.
Before this it gets less certain. The dates are generally based on numerical ages rather than any particular events. Earlier Eras include.
- Mesoproterzic Era(1,600 to 1,000Ma)
- Paleoproterzoic Era(2,500 to 1,600Ma)
- Neoarchean Era(2,800 to 2,500Ma)
- Mesoarchean Era(3,200 to 2,800Ma)
- Paleoarchean Era(3,600 to 3,200Ma)
- Eoarchean Era(4,000 to 3,600Ma)
Before this there are no named eras. It is known as the Hadean Eon(4576 - 4,000Ma).
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