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Subject (Era)
- 21st century7
- 1945-5
- Ordovician3
- 2000-20992
- 20th century2
- Pleistocene2
- 19131
- 1970-1
- 1979-1
- 1981-20011
- 1989-1
- 1991-1
- 2000 - 20991
- Cambrian1
- Devonian1
- From 10 thousand to 2 million years ago1
- From 345 to 405 million years ago1
- From 405 to 500 million years ago1
- From 425 to 500 million years ago1
- From 425 to 570 million years ago1