Time Divisions of Earth's History

  1. Era
    1. Period
      1. Epoch

  1. Paleozoic
    1. Pre-Cambrian
    2. Cambrian
    3. Ordovician
    4. Silurian
    5. Devonian
    6. Carboniferous
      1. Mississippian (North America)
      2. Pennsylvanian (North America)
    7. Permian

  2. Mesozoic
    1. Triassic
      1. Carnian
      2. Norian
      3. Rhaeton
    2. Jurassic
      1. Hettangian
      2. Sinemurian
      3. Pliensbachian
      4. Toarcian
      5. Bajocian
      6. Bathonian
      7. Callovian
      8. Oxfordian
      9. Kimmeridgian
      10. Portlandian
      11. Purbeckian
    3. Cretaceous
      1. Ryazanian
      2. Valanginian
      3. Hauterivian
      4. Barrenmian
      5. Aptian
      6. Albian
      7. Cenomanian
      8. Turonian
      9. Coniacian
      10. Santonian
      11. Campanian
      12. Maastrichtian

  3. Cenozoic
    1. Paleogene
      1. Paleocene
      2. Eocene
      3. Oligocene
    2. Neogene
      1. Miocene
      2. Pliocene
    3. Quaternary
      1. Pleistocene
      2. Halocene