Geologicaltimescale4

Geologic timeline

By zonkejon
  • 4.5 billion years ago
    4500 BCE

    4.5 billion years ago

    Earth was just now starting to geologically form.
  • Archean Eon
    2500 BCE

    Archean Eon

    Earth's crust had cooled enough to allow the continents and life started to form.
  • Proterozoic Eon
    570 BCE

    Proterozoic Eon

    Eon spanning from the time oxygen first appeared on Earth to just before complex life started forming.
  • Cambrian
    541 BCE

    Cambrian

    First geological period of the Paleozoic Era
  • Mississippian
    358 BCE

    Mississippian

    First major subdivision of the Carboniferous Period.
  • Triassic
    251 BCE

    Triassic

    First and shortest period of Mesozoic Era
  • Jurassic
    201 BCE

    Jurassic

    Was the middle period in the Mesozoic Era, also known as the age of reptiles.
  • Cretaceous
    145 BCE

    Cretaceous

    Third and final period in the Mesozoic Period, ended with mass extinction
  • Tertiary
    66 BCE

    Tertiary

    Was a period of time consisting from 66-2.6 mya.
  • Quanternary
    2 BCE

    Quanternary

    Is the most current and most recent of the three periods.