geologic time scale

By sarahg1
  • Big bang!

    Big bang!

    Started 10 billion to 20 billion years ago. A Belgian priest named Georges Lemaître suggested the big bang theory in the 1920s.
  • Period: to

    History of the universe!

  • Precambrian Period

    Precambrian Period

    Started billion years ago. Earth was already more than 600 million years old when life began.
  • Period: to

    Precambrian

    Started 4.5 billion years ago
  • Cambrian Period

    Cambrian Period

    many of the major animal groups alive today started in this period. Cambrian sediments found in Canada, Greenland, and China yield rare fossilized soft-bodied creatures.
  • Period: to

    Paleozoic Era

    An era including Cambrian, Ordovician, Silurian , Devonian, Carbonifirous, and Permian periods.
  • Ordovician Period

    Ordovician Period

    A rich variety of marine life flourished in the vast seas and the first plants began to appear on land.
  • Silurian Period

    Silurian Period

    First plants and animals on land. The many limestone rock formations that date to this period.
  • Devonian Period

    Devonian Period

    http://science.nationalgeographic.com/science/prehistoric-world/devonian/ It dawned about 416 million years ago. The fishes weren't built to last in this period.
  • Mississippian Epoch

    Mississippian Epoch

    Lasted for about 40 million years. Euramerica and western Gondwana drifted northwards and moved closer together.
  • Period: to

    Carboniferous Period

    Divided into the Mississippian and the Pennsylvanian epochs. Carboniferous coal was produced by bark-bearing trees.
  • Pennsylvanian Epoch

    Pennsylvanian Epoch

    Lasted about 33 million years. A result of the collision of Gondwana and Laurasia the supercontinent of Pangea comes into being.
  • Permian Period

    Permian Period

    Pangea came together. The largest mass extinction the Earth has ever known.
  • Triassic Period

    Triassic Period

    http://science.nationalgeographic.com/science/prehistoric-world/triassic/ Something about of violent volcanic eruptions, climate change, or perhaps a fatal run-in with a comet or asteroid. The giant ocean called Panthalassa surrounded Pangaea.
  • Period: to

    Mesozoic Era

    Includes Triassic, jurassic, and Cretaceous periods.
  • Jurassic Period

    Jurassic Period

    http://www.youtube.com/watch?v=4et9IEe148E Dinosaurs, birds, rodents, sea monsters, sharks, and blood-red plankton. The dry deserts slowly took on a greener hue.
  • Cretaceous Period

    Cretaceous Period

    http://www.youtube.com/watch?v=m56kbq3wdaI Rodents scurried at their feet through forests of ferns, cycads, and conifers. At the end of the period, about 80 million years ago, oceans filled yawning gaps between the isolated continents shaped much as they are today.
  • Period: to

    Cenozoic Era

    -- Tertiary period -- Quatemary period -Paleocene epoch -Holocene epoch
    - Eocene epoch -Pleistocene epoch
    - Oligocene epoch
    - Miocene epoch
    - Pliocene epoch
  • Tertiary and Quaternary periods

    Tertiary and Quaternary periods

    Teritary includes Paleogene, Eogene, Oligocene, Miocene, and Pilocene epochs. Quaternary includes Pleistocene and Holocene epochs.
  • Epochs Times

    Epochs Times

    -Paleocene -- 7am
    -Eocene -- 9am
    -Oligocene -- 12pm
    -Miocene -- 1pm
    -Pliocene -- 8pm
    -Pleistocene -- 11:30pm
    -Holocene -- 11:59pm