✦ Earth began formation about 4.54 billion years ago

✦ Supereon → Eon → Era → Period → Epoch → Age

• PRECAMBRIAN SUPEREON (4.54 bya ~ 541 mya)

• HADEAN EON (4.54 ~ 4.0 bya)

• ARCHEAN EON (4 ~ 2.5 bya)
  • Eoarchean Era
  • Paleoarchean Era
  • Mesoarchean Era
  • Neoarchean Era

• PROTEROZOIC EON (2.5 ~ 541 mya)
  • Paleoproterozoic Era
    • Siderian Period
    • Rhyacian Period
    • Orosirian Period
    • Statherian Period

• Mesoproterozoic Era
  • Calymmian Period
  • Ectasian Period
  • Stenian Period

• Neoproterozoic Era
  • Tonian Period
  • Cryogenian Period
  • Ediacaran Period

• PHANEROZOIC EON (541 mya ~ present)
  • Paleozoic Era
    • Cambrian Period
    • Ordovician Period
    • Silurian Period
    • Devonian Period
    • Carboniferous Period
    • Permian Period

• Mesozoic Era (252 ~ 66 mya)
  • Triassic Period
  • Jurassic Period
  • Cretaceous Period

• Cenozoic Era (66 mya ~ present)
  • Paleogene Period
  • Neogene Period

• Quaternary Period (2.58 mya ~ present)
  • Holocene Epoch
  • Greenlandian Age
  • Northgrippian Age
  • Meghalayan Age (4.2 tya ~ present)

Currently

• PHANEROZOIC EON
  • CENOZOIC ERA
    • QUATERNARY PERIOD
      • HOLOCENE EPOCH
        • MEGHALAYAN AGE