Geologic Timescale

  • Cambrian Period- 570-500 MYA

    Cambrian Period- 570-500 MYA
    The earliest marine life was recorded. The Trilobites were dominant during that time period. The Cambrian period was the first period in the Paleozoic era. It ranged from 570 MYA to 500 MYA.
  • Ordovican -500-435 MYA

    Ordovican -500-435 MYA
    Enchinoderms (Starfish, Sand dollars, sear urchins and sea cucumbers) come around. Invertebrates are dominant and mollusks became abundant. The earliest fish were jawless and later on, they became jawed and armored.
  • Silurian 435-395 MYA

    Silurian 435-395 MYA
    The earliest terrestrial plants and animals. Some of the animals of that time was the Tiktaalik and the Eurypterids (sea scorpins).
  • Devonian 395-345 MYA

    Devonian 395-345 MYA
    The armored fish that had come around in the Ordovician time period become extinct, but an abundance of serveral other species of fish come around. The earliest amphibians and ammonities also come into existence.
  • Carboniferous 345-280 MYA

    Carboniferous  345-280 MYA
    An abundance of sharks and amphibians come around in the Carboniferous era. Large swamps become a reality, and coal forming forests grow. The earliest reptiles come around. Scale trees and seed ferns come around towards the end of the era.
  • Permian 280-225 MYA

    Permian  280-225 MYA
    The Permian period was the end of the Paleozoic era. There was the extinction of many marine animals...including the trilobites. It was the largest extinction in history.Pangea was also created.
  • Triassaic 225-195 MYA

    Triassaic  225-195 MYA
    The Paleozoic ends, and the Mesozoic begins. The Triassic period was the first era in the Mesozoic era. The earliest dinosaurs come around, though they weren't like the dinosaurs we know. There was an abundance of cycads and conifers.
  • Jurassic 195-136 MYA

    Jurassic 195-136 MYA
    The Jurassic period held the earliest birds and mammals. There was and abudant amount of dinosaurs (like we know about) and ammonities.
  • Cretaceous 136-65 MYA

    Cretaceous 136-65 MYA
    The earliest flowering plants come around in the Cretaceous period. It was also the climax of the dinosaurs, and it was also the period where the dinosaurs became extinct. It was one of the largest extinctions. There was also a great decline of brachiopods and there came an abundance of bony fish.
  • Tertiary 65-1.8 MYA

    Tertiary  65-1.8 MYA
    Earliest placental mammals, modern mammals, and large running mammals come into existence.
  • Quaternary 1.8 MYA - present

    Quaternary  1.8 MYA - present
    This could be considered the modern age, as there are many creatures in this era that we all know and may have seen. There are the humans, large carnivores, etc. There was also the Nehanderthals and the mastodons.