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Era
- 20th century941
- 19th century786
- 17th century426
- 18th century410
- Cretaceous361
- Tertiary219
- Quaternary186
- Paleozoic155
- Pleistocene153
- Devonian134
- 16th century128
- Precambrian128
- Eocene127
- Ordovician120
- Permian119
- Cenozoic117
- To 1500113
- Mesozoic109
- Miocene108
- Jurassic101