Geologic time img

Geologic Times

By Samantha Flores
  • 4600 BCE

    Formation of Earth

    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.
  • 3800 BCE

    Hadean Eon

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

    Archean Eon

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

    Proterozoic Eon

    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)
  • 505 BCE

    Ordovician and Cambrian period

    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
  • 438 BCE

    Silurian Period

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

    Devonian period

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

    Carboniferous Period

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

    Permian Period

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

    Triassic Period

    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)
  • 208 BCE

    Jurassic Period

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

    Cretaceous Period

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

    Tertiary Period

    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
  • 1 CE

    Quaternary Period

    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