Geologic time drawing

Geological Timescale Timeline Project

By 0607125155

  • Precambrian Time

    Precambrian Time
    Event 1. There is very little plant life during this period.
    Event 10- The presence of stromatolites indicates the shallow seas covered much of Earth during intervals in this period
    Event 11- Nearly half of the valuable mineral deposits in the world occur in the rocks of this period
  • Period: to

    F. Chamorro P-6

    Geological Timescale

  • Cambrien

    Cambrien
    Event 22- Trilobites appear
    Event 23- Shelled brachiopods appear

  • Ordovician

    Ordovician
    Event 27- Many early mammal become extinct, clams and snail flourish
    Event 30- Colonies of tiny invertebrates call graptolites flourished and vertebrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates

  • Silurian

    Silurian
    Event 24- Eurypterids (sea scorpions), sea stars and coral become more common.
    Event 33- Vascular land plants and animals, such as scorpions begin to evolve on land.

  • Devonian

    Devonian
    Event 31- Huge plants begin to develop, early amphibians form
    Event 37- Age of fishes, fish that can breath out of water and spend time on land form.

  • Carboniferous

    Carboniferous
    Event 2- Swamps and forests cover the land
    Event 4- Giant cockroaches appear
    Event 15- Coal deposits form
    Event 21- Early reptiles resembling large lizards appear

  • Permian

    Permian
    Event 38- Environmental change causes mass extinction of sea invertebrates (trilobites and eurypterids) as the seas retreat.
    Event 7- Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere.

  • Triassic

    Triassic
    Event 16- Welcome to the world of the Dinosaur! Enter the squirrel-sized dinosaur & the first forest dwelling mammals appear.
    Event 34- Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop.

  • Jurassic

    Jurassic
    Event 3- Flying reptiles called pterosaurs are in the air now.
    Event 13- Whoa those dinos are getting big & dominate the land - Lizard-hipped and bird-hipped appear - carnivores and herbivores has arrived.

  • Cretaceous

    Cretaceous
    Event 5- First flowering plants appear- angiosperm
    Event 35- Impact hypothesis - dinosaurs mass extinction.

  • Paleocene

    Paleocene
    Event 12- First prime apes evolve.

  • Eocene

    Eocene
    Event 26- First modern horses appear.
    Event 29- Small rodents evolve.

  • Oligocene

    Oligocene
    Event 32- Antarctic ice caps begin to form

  • Miocene

    Miocene
    Event 36- Mediterranian Sea dries up and refills several times due to tectonic forces and dropping sea levels.

  • Pliocene

    Pliocene
    Event 18- Various species migrated between continents across land bridges

  • Pleistocene

    Pleistocene
    Event 25- World wide temperatures drop about 4 degrees celsius (39.2 degrees farenheit)

  • Holocene

    Holocene
    Event 7- Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere.
    Event 19- The last glacial period ended sea levels rose, Great lakes formed.
    Event 20- Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct(dire wolf & giant ground sloth)
    Event 28- Modern human developed agriculture and used tools made of bronze and iron