Geologic Timescale

  • Cambrian Period 570-500 MYA

    Cambrian Period 570-500 MYA
    Earliest marine life recorded. Abundant amount of Trilobites.
  • Ordovician 500-435 MYA

    Ordovician 500-435 MYA
    Shallow seas covered large area of the world, lichen-like plants had begun to adapt themselves to life on land.
  • Silurian 435-395 MYA

    Silurian 435-395 MYA
    Cephalopods diversified to a variety of shapes and sizes.
  • Devonian 395-345 MYA

    Devonian 395-345 MYA
    During the Devonian Period, which occurred in the Paleozoic era, the first fish evolved legs and started to walk on land as tetrapods around 365 Ma.
  • Carboniferous 345-280 MYA

    Carboniferous 345-280 MYA
    The Carboniferous was a time of glaciation, low sea level and mountain building; a minor marine extinction event occurred in the middle of the period.
  • Permian 280-225 MYA

    Permian 280-225 MYA
    It is the last period of the Paleozoic Era and famous for its ending epoch event, the largest mass extinction known to science.
  • Triassic 225-195 MYA

    Triassic 225-195 MYA
    During the Triassic, both marine and continental life show an adaptive radiation beginning from the starkly impoverished biosphere that followed the Permian-Triassic extinction.
  • Jurassic 195-136 MYA

    Jurassic 195-136 MYA
    The start of the period is marked by the major Triassic–Jurassic extinction event. However the end of the Jurassic Period did not witness any major extinction event.
  • Cretaceous 136-65 MYA

    Cretaceous 136-65 MYA
    The Cretaceous was a period with a relatively warm climate and high eustatic sea level. The oceans and seas were populated with now extinct marine reptiles, ammonites and rudists; and the land by dinosaurs.
  • Tertiary 65-1.8 MYA

    Tertiary 65-1.8 MYA
  • Quaternary 1.8 MYA - present

    Quaternary 1.8 MYA - present