Geological Timescale Timeline Project

By D.Sala

  • Precambrian Period

    Event 10: The presence of of stromatolites indicates that shallow seas covered much of Earth during intervals in this period.
  • Period: to

    DSalazar P.6

    Geological Timescale

  • Cambrian

    Event 22: Trilobites appear. Event 23:Shelled brachiopods appear. Event 34: Ichthyosaurs are living in the ocean,new invertebrates call ammonite develop.

  • Ordovician

    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. Event 38: Environmental change causes mass extinction of sea invertebrates (trilobites amd eurypterids) as the seas retreats.

  • 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. Event 38: Environmental change causes mass extinction of sea invertebrates (trilobites and eurypterids) as the seas retreat.

  • Devonian

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

  • Mississippian period

    Event 2: Swamps and forests cover the land.

  • Pennsylvanian Period

    Event 4: Giant cockroaches appear. Event 15: Coal deposits form.

  • Carboniferous

    Event 21: Early reptiles resembling large ulizards appear.

  • Permian

    Event 35: Impact hypothesis- dinosaur mass exctinction

  • Triassic

    Event 16: Welcome to the world of the dinosaur! Enter the squirrel sized dinosaur and the first forest dwelling mammals appear

  • Jurassic

    Event 13: Whoa those Dino's are getting big and dominate the land- lizard hipped and bird hipped appear- carnivores and herbivores arrive.

  • Cretaceous

    Event 7: Some scientists believe that human kind has cause mass extinctions of plant and animal species , polluted the oceans and altered the atmosphere.

  • Paleocene

    Event 12: First primates evolve.

  • Eocene

    Event 25: World Wide temperatures drop about 4 degrees Celsius ( 39.2 degrees Fahrenheit).

  • Oligocene

    Event 6: Himalayas develop due to uplifting caused by the Indian continent and Eurasian continents colliding. Event 27: Many early mammals became extinct, clams and snails flourish.

  • Miocene

    Event 32: Antartic ice caps begin to form.

  • Pliocene

    Event 18: Various species migrated between continents across land bridges.

  • Pleistocene

    Event 9: Homosapiens (modern human )appeared and are hunters

  • Holocene

    Event 28: Modern human developed agriculture and made tools from bronze and iron