History of the Earth

By csanding2014
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    Earth was formed 4.6 billion years ago.

    The Earth was formed 4.6 billion years ago.
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    Water was on Earth 3.8 billion years ago.

    Earth's surface cooled enough for water to remain liquid.
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    Rocks were formed 4 billion years ago.

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    Photosynthetic bacteria began pumping oxygen 2.2 billion years ago.

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    Ordovician Period 505-440 mil. yr. ago : Octopi, squid.

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    Silurian Period 440-410 mil. yr. ago: Jawless fish, land plants.

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    Devonian Period 410-360 mil. yr. ago: Insects. Age of Fishes.

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    Carboniferous Period 360-290 mil. yr. ago: Reptiles.

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    Cambrian Period 544-505 mil. yr. ago: Invertebrates, trilobites, brachiopods.

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    Permian Period 290-245 mil. yr. ago: Reptiles.

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    Triassic Period 245-208 mil. yr. ago: Dinosaurs.

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    Jurrasic Period 208-145 mil. yr. ago: Age of Reptiles.

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    Cretaceous Period 145-65 mil. yr. ago: Leafy trees, shrubs, small flowering plants. Mass extinction.

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    Tertiary Period 65-1.8 mil. yr. ago: Marine mammals.

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    Quaternary Period 1.8 mil. yr. ago-present: Humans.