Geological timeline

Geological Timescale Timeline

By sabrinacabrera

  • Precambrian Period (4,600 MA)

    Precambrian Period (4,600 MA)
    1. The presence of stromatolites indicates that shallow seas covered much of Earth during intervals. 11. Nearly half of the valuable mineral deposits in the world occur in the rocks of this period.
  • Period: to

    s cabrera period 6

    Geological Timeline

  • Cambrian Period (542 MA)

    Cambrian Period (542 MA)
    1. Trilobites appear. 23.Shelled brachiopods appear

  • Ordovician Period (488 MA)

    Ordovician Period (488 MA)
    1. There is very little plant life during this period. 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 Period (444 MA)

    Silurian Period (444 MA)
    1. Eurypterids (sea scorpions), sea stars, and coral become more common. 33. Vascular land plants and animals, such as scorpions begin to evolve on land

  • Devonian Period (416 MA)

    Devonian Period (416 MA)
    1. Huge plants begin to develop, early amphibians form. 37. Age of Fishes, fish that can breathe out of the water and spend time on land form

  • Mississippian Period (359 MA)

    Mississippian Period (359 MA)
    1. Swamps and forests cover the land. 21. Early reptiles resembling large lizards appear.

  • Pennsylvanian Period (318 MA)

    Pennsylvanian Period (318 MA)
    1. Giant cockroaches appear. 15. Coal deposits form.

  • Permian Period (299 MA)

    Permian Period (299 MA)
    1. Appalachian Mountains are created because of the collision of tectonic plates and savannahs form. 38. Environmental change causes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat.

  • Triassic Period (299 MA)

    Triassic Period (299 MA)
    1. Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling animals appear. 34. Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop

  • Jurassic Period (200 MA)

    Jurassic Period (200 MA)
    1. Flying reptiles called pterosaurs are in the air now. 13. Whoa those dines are getting big & dominate the land- lizard-hipped and bird-hipped appear - carnivores and herbivores have arrived.

  • Cretaceous Period (146 MA)

    Cretaceous Period (146 MA)
    1. First flowering plants appear- angiosperm. 35. Impact hypothesis- dinosaur mass extinction

  • Paleocene Epoch (65.5 MA)

    Paleocene Epoch (65.5 MA)
    1. First primates evolve. 29. small rodents evolve

  • Eocene Epoch (55.8 MA)

    Eocene Epoch (55.8 MA)
    1. Flying squirrels, whales, and bats appear. 25. World wide temperatures drop about 4 degrees celsius.

  • Oligocene Epoch (33.9 MA)

    Oligocene Epoch (33.9 MA)
    1. Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding. 27. Many early mammals become extinct, clams and snails flourished.

  • Miocene Epoch (23.0 MA)

    Miocene Epoch (23.0 MA)
    1. Antarctic icecaps begin to form. 36. Mediterranean Sea dries up and refills several times due to tectonic forces and dropping sea levels

  • Pliocene Epoch (5.3 MA)

    Pliocene Epoch (5.3 MA)
    1. Various species migrated between continents across land bridges. 26. first modern horses appear

  • Pleistocene Epoch (1.8 MA)

    Pleistocene Epoch (1.8 MA)
    1. Homosapien(modern humans) appeared & are hunters. 20. Species that did not evolve to survive extreme cold moved to warmer climates or became extinct.

  • Holocene Epoch (0.0115 MA)

    Holocene Epoch (0.0115 MA)
    1. The last glacial period ended and sea levels rose, Great Lakes formed. 28. Modern human developed agriculture and used tools made out of bronze and iron.

  • Anthropocene Epoch (Current Date)

    Anthropocene Epoch (Current Date)
    1. Some scientists believed that humankind has caused mass extinctions of plant and animal species, polluted the oceans, and altered the atmosphere. 14. There is argument to when this epoch began, some scientists think it began with the industrial age in the early 1800's others think it began with the atomic age in the 1950's