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Era

• 20th century (21)
• 18th century (14)
• 19th century (12)
• Cenozoic (12)
• 17th century (11)
• Cretaceous (11)
• Miocene (8)
• 21st century (4)
• Tertiary (4)
• 2000- (3)
• Colonial period, ca. 1600-1775 (3)
• Eocene (3)
• Jurassic (3)
• Mesozoic (3)
• Paleozoic (3)
• Pleistocene (3)
• Quaternary (3)
• 16th century (2)
• 1912-1949 (2)
• 1976-2000 (2)