Dilbertanthrop

Geological scale

By Pandaaa@aa
  • Period: to

    RAbolade period3

    Geological Timescale

  • Cambrian

    Cambrian
    1. Trilobites appear. 23. Shelled brachiopods appear.

  • Ordovician

    Ordovician
    1. Colonies of tiny inverebrates call graptplites florished and vertebrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates. 38. Environmentral changes causes mass extinction of sea invertibrates(trilobites& eurypterids) as the seas retreat.

  • Silurian

    Silurian
    1. Eurypteriods (sea scorpions), sea stars and corals become more common.

  • Devonian

    Devonian
    1. Age of Fishes, fish that can breath out of the water and spend time on land form. 21. Early reptiles resembling large lizards appear.

  • Carboniferous

    Carboniferous
    1. Swamps and forests cover the land. 15. Coal deposits form.

  • Permian

    Permian
    1. Appalachian Mountains are created because of the collision of tectonic plates & Savannahs form. 31. Huge plants begins to develop, early amphibians form.

  • Triassic

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

  • Jurassic

    Jurassic
    1. Flying reptiles called pterosaurs are in the air now 12. First primates evolve. 13. Whoa those dinos are getting big & dominate the land- lizard hipped and bird hipped appear- carnivores and herbivores have arrived.

  • Cretaceous

    Cretaceous
    1. first flowering pants appear- angisperm. 35. Impact hypoththesis- dinosaur mass extinction.

  • Percambrian

    Percambrian
    11.Nearly half of the valuable mineral deposits in the world occur in the rocks of this period.

  • Paleocene/ Eocene

    Paleocene/ Eocene
    1. World wide temperatures drop about 4 degrees celsius(39.2 degrees fahrenheit). 26. First rodent evolve. 29. Small rodents evolve.

  • Oligocene

    Oligocene
    1. Himalayas develop due to uplifting caused by the indian subcontinent of plant Eurasian continents colliding.

  • Miocene

    Miocene
    1. Mediterranean Sea dries up and refills several times due to tectonic forces a dropping sea levels.

  • Pliocene

    Pliocene
    1. Various species migrated between continents across land bridges.

  • Pleistocene

    Pleistocene
    1. Species that did not evolve to survive extreme cold moved to a warmer climate areas or became extinct (dire wolf & giant ground sloth)

  • Holocene

    Holocene
    1. The last glacial period ended and the sea levels rose ,the great lakes formed.28. Modern humans developed agriculture and used tools made of bronze and iron.

  • Anthropocene

    Anthropocene
    There is an argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800's others think it began with the atomic age in the 1950's