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Era

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• Cretaceous18
• Pre-Quaternary6
• Quaternary6
• Cenozoic5
• Jurassic4
• Paleozoic3
• 17th century2
• Civil War, 1861-18652
• 16th century1
• 1775-18651
• 1849-18771
• 18631
• 18th century1
• 19th century1
• 20th century1
• 476-14921
• Cambrian1
• Colonial period, ca. 1600-17751
• Middle Ages, 600-15001
• Precambrian1

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