Geological Timescale Timeline Project

By martindirektor

  • Precambrian Time

    Precambrian Time
    1. Nearly half of the valueable mineral daposits in the world occur in the rocks of this period. 15. Coals deposist form.
  • Period: to

    M Ortega P.1

    Geological Timescale

  • Cambrian

    Cambrian
    1. Trilobites appear. 36.Mediterranean Sea dries up and refills several times due to tectonic forcesa dn dropping sea levels.

  • Ordovician

    Ordovician
    1. Colonies of tiny invertebrates call graptolites florished and vertibrates appear, fish did not have jaws or teeth and their bodies were covered with bony plate. 23. Shelled rodents evolve.

  • Silurian

    Silurian
    1. Vascular land plants and animals, such as scorpions begin to evolve on land. 10. The presence of stromatolites that shallow seas covered much of Earth during intervals in this period.

  • devonian

    devonian
    1. Age of fishes, fish that can breath out of the water and spend time on land form

  • mississippian

    mississippian
    1. There is very little plant life during this period. 24. Eurypterids (sea scorpions), sea stars and coral become more common.

  • pennsylvanian

    pennsylvanian
    1. Giant cockroaches appear 38. Enviromental change causes mass extintion of sea invertebrates (trilobites and eurypterids) as the seas retreat.

  • permian

    permian
    1. Appalachian Mountains are created because of the collision of tactonic plates and savannahs form. 6. Himalayas develop due to uplifting caused by the Indean subcontinent and Euracian continets colling.

  • triassic

    triassic
    1. Fying reptiles called pterosaurs are in the air now. 16. Welcomo to the world of the Dinosaur! Enter the squirrel sized dinosaur and the first forest dwelling mammals appear.

  • Jurassic

    Jurassic
    1. Whoa those dinos are getting big and dominate the land - lizard hipped and bird-hipped appear - carnivores and herbivores have arrived.

  • Cretaceous

    Cretaceous
    34.Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop.5. first flowering plants appear - angiosperm

  • Paleocene

    Paleocene
    1. Impact hypothesis - dinosaur mass extintion. 12. First primates evolve.

  • Eocene

    Eocene
    1. Flying squirrels, whales and bats appear. 32. Antartictc icecaps beging to form.

  • Oligocene

    Oligocene
    1. Small rodents evolve. 27. Many early mammal become extinct, clams and snails flourish.

  • Miocene

    Miocene
    1. first modern horses appear. 2. Swampsand forests cover the land.

  • Pliocene

    Pliocene
    1. World wide temperatures drop 4 degrees celsius (39.2 degrees fahrenheit) 20.Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct(dire wolf and giant ground sloth)

  • Pleistocene

    Pleistocene
    1. Various species migrated between continents across land bridges. 19. The last glacial period ended and sea levels rose, Great lakes fomed.

  • Holocene

    Holocene
    1. Homosapien (modern humans) appeared and are hunters. 28. Modern human developed agriculture and used tools made of bronze and iron.

  • Anthroporcene

    Anthroporcene
    1. Some scientists believe that human kind has caused mass extinctions of plant and animal apecies, polluted the oceans and altered the atmosphere. 14. There is argument as to when this epoch began, some scientists think it began with the industrial age in the early 1800's other think it began with the atomic age in the 1950's.