Earth2

Period 7, Blaylock & Smith, History of Earth Timeline

  • (5 billion years ago) Solar System Forms

    (5 billion years ago) Solar System Forms
    The solar system was born.
    • 5 million years ago, the birth of this solar system occurred, including the creation of the nine planets that still exist among the Milky Way today.
  • (4.6 billion years ago) Earth began to form

    (4.6 billion years ago) Earth began to form
    This was the very beginning of the Earth.
    • 4600 million years ago, the earth began to form from what most people believe to be caused from the big bang theory.
  • (3.7 billion years ago) Evidence of Life on Earth

    (3.7 billion years ago) Evidence of Life on Earth
    This appeared to be some of the first life on earth.
    • 3700 years ago, the earth began to show various amounts of evidence of life.
  • (3.7 billion years ago) Photosythesizing Bacteria

    (3.7 billion years ago) Photosythesizing Bacteria
    • 3700 million years ago, photosynthesizing bacteria began to form
  • (3.5 billion years ago) Oldest Fossils

    (3.5 billion years ago) Oldest Fossils
    • 3500 million years ago, studies show that the oldest fossil formed from that era.
  • (2.2 billion years ago) Oxygen Appears

    (2.2 billion years ago) Oxygen Appears
  • (1.8 billion years ago) Oldest Eukaryote Fossils

    (1.8 billion years ago) Oldest Eukaryote Fossils
    • 18 million years ago, the oldest eukaryotic fossils have been shown from this time period
  • (800 million years ago) Major Glaciation Period Begins

    (800 million years ago) Major Glaciation Period Begins
    • 800 million years ago, the major glaction period began, which in a sort was kinda like the ice age.
  • (600 million years ago) Protective Ozone Layer in Space

    (600 million years ago) Protective Ozone Layer in Space
    • 600 million years ago, the protective ozone layer in space began to form
  • (480 million years ago) Land Plants

    (480 million years ago) Land Plants
    • 480 million years ago, plants and land were able to begin forming
  • (400 million years ago) Oxygen Nears Present Day Levels

    (400 million years ago) Oxygen Nears Present Day Levels
    • Around 400 million years ago, oxygen levels began to near present day levels, allowing much more life to form.
  • (350 million years ago) Reptiles

    (350 million years ago) Reptiles
    • 350 million years ago were the first signs of reptiles roaming the earth
  • (250 million years ago) Permian

    (250 million years ago) Permian
    • 250 million years ago was the period of the late Triassic when dinosaurs were the most prevalent creature roaming the earth
  • (220 million years ago) Mammals

    (220 million years ago) Mammals
    • 220 million years ago, the Permian period began, which was avery important peiod in history due to the creatures that evolved during that time.
  • (200 million years ago) Pangaea Starts to Break Apart

    (200 million years ago) Pangaea Starts to Break Apart
    • 200 million years ago, pangea began to break apart, Seperating parts of the contenent into differnt hemesphers
  • (65 million years ago) End Cretaceous

    (65 million years ago) End Cretaceous
    65 million years ago, the end of the cretaceous period came
  • (60 million years ago) Primates

    (60 million years ago) Primates
    60 million years ago, the first sign of primates were shown, which was, at the time, the most intellegent mammles on the earth
  • (5.2 million years ago) Whales

    (5.2 million years ago) Whales
    5.2 million years ago, whales were developed, being one of teh ocean's most large creatures.
  • (100,000 years ago) Modern Humans

    (100,000 years ago) Modern Humans
    100,00 years ago, humans began to roam the earth, and just as humans supposedly evolved from monkeys - a less intellegent mammle, we are still getting more intellegent as time goes by.
  • (100,000 years ago) Late Pleistocene

    (100,000 years ago) Late Pleistocene
    Large animals became extinct, and smaller ones became more prevelant