Geologic time img

Geologic Times

By Samantha Flores
  • Formation of Earth
    4600 BCE

    Formation of Earth

    4600 MYA (Million Years Ago)
  • Period: 4600 BCE to 570 BCE

    Precambrian Era

    4600-570 MYA (Million Years Ago)
    covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms almost four billion years later.
  • Hadean Eon
    3800 BCE

    Hadean Eon

    Priscoan Period; 3800 MYA (Million Years Ago)
    -Atmosphere and oceans form, -Oldest rocks form as earth cools
  • Archean Eon
    2500 BCE

    Archean Eon

    2500 MYA (Million Years Ago)
    -Photosynthesizing cyanobacteria appear,
    -First unicellular life appear
  • Proterozoic Eon
    570 BCE

    Proterozoic Eon

    570 MYA (Million Years Ago)
    -First soft-bodied animals appear
    -First multicellular life appear
  • Period: 570 BCE to 245 BCE

    Paleozoic Era

    570-245 MYA (Million Years Ago)
  • Ordovician and Cambrian period
    505 BCE

    Ordovician and Cambrian period

    Age of Invertebrates; 570-505 MYA (Million Years Ago)
    -Ordovician: *Silurian extinction event, *First vertebrates appear
    -Cambrian: *End botomian extinction event, *First fungi appear, *Triblobites are dominants
  • Silurian Period
    438 BCE

    Silurian Period

    438 MYA (Million Years Ago)
    -First land plant appear, - First jawed fishes appear, -First insects appear
  • Devonian period
    408 BCE

    Devonian period

    Age of fishes; 408 MYA (Million Years Ago)
    -Late devonian extinction event, -First land animals appear, -First amphibians appear
  • Carboniferous Period
    360 BCE

    Carboniferous Period

    360 MYA (Million Years Ago)
    -First reptiles appear, -First large cartilaginous fishes appear
  • Permian Period
    286 BCE

    Permian Period

    Age of amphibians; 286 MYA (Million Years Ago)
    -Triassic extinction event, -Pangaea forms
  • Triassic Period
    245 BCE

    Triassic Period

    Fist Dinosaurs Era; 245 MYA (Million Years Ago)
    -Pangaea cracks, -First mammals appear, -Reptiles are dominant
  • Period: 245 BCE to 65 BCE

    Mesozoic Era (Age of reptiles)

    245-65.5 MYA (Million Years Ago)
  • Jurassic Period
    208 BCE

    Jurassic Period

    208 MYA (Million Years Ago)
    -First birds appear, -Pangaea splits into Laurasia, Gondwanna, -Dinosaurs are dominant
  • Cretaceous Period
    144 BCE

    Cretaceous Period

    Extinction of dinosaurs; 144 MYA (Million Years Ago)
    *K-T extinction event, *Earth looks closer to prsent-day, *Flowering plants appear
  • Tertiary Period
    65 BCE

    Tertiary Period

    65.5-1.6 MYA (Million Years Ago)
    *Paleocene (65.5 MYA): First large mammals appear;
    *Eocene (57.8MYA): oligocene extinction event;
    *Oligocene (36.6 MYA): Mammals are dominant;
    *Miocene (23.7 MYA): Grass becomes widespread;
    *Pliocene (5.3 MYA): Hominicids (human ancestors) appear
  • Period: 65 BCE to 2020 BCE

    Cenozoic Era (Age of mammals)

    65.5 MYA (Million Years Ago) - Present Day
  • Quaternary Period
    1 CE

    Quaternary Period

    1.6 MYA (Million Years Ago) - Today
    *Pleistocene (1.6 MYA): -Earliest humans appear, -Ice age begins
    *Holocene (0.01 MYA-Today): -Ice age ends, -Humans are dominant