geologic timespan

By jbizly

  • Precambrian

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

    J Byrd Period7

    geological timescale

  • Cambrian

    1. Trilobites appear. 23. Shelled brachiopods appear.

  • Orovician

    1. There is very little plant life during this period. 30. Colonies of tiny invertebrates call graptolites florished and vertibrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates.

  • Silurian

    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

    1. Huge plants begin to develop, early amphibians form. 37. Age of fishes, fish that can come out of the water and spend time on land form.

  • Mississippian

    1. Swamps and forests cover the land. 21. Early reptiles resembling large lizards appear.

  • Pennsylvanian

    1. Giant cockroaches appear. 15. Coal deposits form

  • Permian

    Appalachian Mountains are created because of the collision of tectonic plates and & savannahs form. 38. Environmental change causes mass extinction of sea invertibrates (trilobites and eurypterids) as the sea retreat.

  • Triassic

    1. Ichthyosaurs are living in the ocean, new invertibrates call ammonite develop. 16. Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the forest dwelling mammals appear.

  • Jurassic

    1. Flying reptiles called pterosaurs are int he air now. 13. Whoa those dinos are getting big & dominate the land - Lizard hipped and bird-hipped appear - carnivores and herbivores have arrived

  • Cretaceous

    1. First flowering plants appear - angiosperm. 35. Impact hypothesis - dinosaur mass extinction.

  • Paleocene

    1. Small rodents evolve. 12. First primates evolve

  • Eocene

    1. Flying squirrels, whales and bats appear. 25. World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit)

  • Oligocene

    1. Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding. 27. Many mammal become extinct, clams and snails flourish.

  • Miocene

    1. Antarctic icecaps begin to form. 36. Mediterranean Sea dries up and refills several times due to tectonic forcesa dn dropping sea levels

  • Pliocene

    1. Various species migrated between continents across land bridges. 26. First modern horses appear.

  • Pleistocene

    1. Homosapien (modern humans) appeared & are hunters. 20. Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf & giant ground sloth)

  • Holocene

    1. The last global period ended and sea levels rose, Great lakes formed. 28. Modern human developed agriculture and used tools made of bronze and iron.

  • Anthropocene

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