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Temporal Coverage
- Quaternary63
- Cretaceous53
- Civil War, 1861-186543
- Precambrian26
- Cenozoic24
- Paleozoic23
- 19th century19
- Jurassic13
- Revolution, 1775-178313
- Pleistocene12
- 1914-191810
- Devonian10
- French and Indian War, 1754-176310
- Pre-Quaternary10
- Tertiary10
- Ordovician9
- Silurian9
- 19th century.8
- From 2 million years ago8
- From 65 million years ago8
