History of Earth

Timeline created by sgomez2013
  • 200

    Earth was formed 4.6 billion yrs ago.

    Earth was formed 4.6 billion yrs ago.
    Earth was formed 4.6 billion years ago.
  • 200

    Rocks were formed 4 billion yrs ago.

    Rocks were formed 4 billion yrs ago.
    Earth cooled and solid rocks formed on its surface.
  • 200

    Water was on Earth 3.8 billion yrs ago.

    Water was on Earth 3.8 billion yrs ago.
    Earth's surface cooled enough for water to remain a liquid, and oceans covered much of the surface.
  • 300

    Photosynthetic bacteria pump oxygen.

    Photosynthetic bacteria pump oxygen.
    Photosynthetic bacteria began to pump oxygen.
  • 400

    Precambrian: 650-544 million yrs ago.

    Precambrian: 650-544 million yrs ago.
    Vendian period. Life first began.
  • 500

    Paleozoic Era: 544 million yrs ago.

    Paleozoic Era: 544 million yrs ago.
    Many vertebrates and invertebrates lived during this time. Cambrian period: 544-505 millions of yrs ago. Invertebrates, brachiopods, trilobites. Ordovician period: 505-440 millions of yrs ago. Silurian period: 440-410 million of yrs ago. Arthropods became 1st land animals. First vertebrates appeared. First land plants evolved from aquatic ancestors. Carboniferous period: 360-290 millions of yrs ago. Devonian period: 410-360 millions of yrs ago. Permian period: 290-245 millions of yrs ago.
  • 500

    Devonian Period: Age of fish

    Devonian Period: Age of fish
    Some plants adapted to drier areas and invaded more habitats. Insects appeared on land. Most fishes had jaws, bony skeletons, and scales.
  • 599

    Age of Reptiles: Mesozoic

    Age of Reptiles: Mesozoic
    Triassic: fishes, insects, reptiles, and cone-bearing plants. Jurassic: Birds. Cretaceous: Reptiles, birds, turtles, crocodiles, fishes, and marine invertebrates. Leafy trees, shrubs, and small flowering plants.
  • Feb 1, 600

    Mesozoic Era: 245 million years ago

    Mesozoic Era: 245 million years ago
    Dinosaurs lived during this time. Mammals began to evolve during this era. Triassic period: 245-208 millions of years ago. Jurassic period: 208-145 millions of years ago. Cretaceous period: 145-65 millions of years ago.
  • Apr 11, 699

    Age of Mammals: Cenozoic

    Age of Mammals: Cenozoic
    Tertiary: climate was warm and mild. Marine mammals; whales and dolphins evolved. Grasses evolved, providing food for grazing mammals.Some mammals became very large, as did some birds. Quaternary Period: Earth’s climate cooled, causing a series of ice ages. About 20,000 years ago, Earth’s climate began to warm and sea levels began to rise. In the oceans, algae, coral, mollusks, fishes, and mammals thrived.Insects, birds, and land mammals were common
  • Apr 11, 700

    Cenozoic Era: 65 million yrs ago-present

    Cenozoic Era: 65 million yrs ago-present
    Mammals became common during the Cenozoic. Tertiary period: 65-1.8 millions of years ago. Quaternary period: 1.8-present
  • Period:
    Apr 11, 700
    to

    Cenozoic Era