GEOLOGIC TIME SCALE

The geologic time scale provides evidence of some of the major events that have helped to shape our planet. Here you can learn all about the geologic time scale.

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Epoch (Geology)

Epoch, in geology, a subdivision of geologic time. Geologists divide the earth's history into eras, which are subdivided into periods.

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  • Cenozoic Era
    Cenozoic Era

    Cenozoic Era, the most recent great division of geological time, including the present. See more »

  • Mesozoic Era
    Mesozoic Era

    Mesozoic Era, one of the major divisions of geologic time. It is sometimes called the Age of Reptiles. See more »

  • Paleozoic Era
    Paleozoic Era

    Paleozoic Era, one of the major divisions of geologic time. It began 570,000,000 years ago and ended 240,000,000 years ago. See more »

  • Archeozoic Era
    Archeozoic Era

    Archeozoic Era, a division of geologic time used by some geologists. The Archeozoic Era corresponds to early Pre-cambrian Time. See more »

  • Cambrian Period
    Cambrian Period

    Cambrian Period, the first geologic period of the Paleozoic Era. It began 570,000,000 years ago and lasted 70,000,000 years. See more »

  • Cretaceous Period
    Cretaceous Period

    Cretaceous Period, a division of geologic time that began about 140,000,000 years ago and lasted about 65,000,000 years. See more »

  • Devonian Period
    Devonian Period

    Devonian Period, a division of geologic time. It began about 395,000,000 years ago and lasted about 35,000,000 years. See more »

  • Eocene Epoch
    Eocene Epoch

    Eocene Epoch, a division of geologic time that began about 54,000,000 years ago and lasted about 17,000,000 years. See more »

  • Epoch (Geology)
    Epoch (Geology)

    Epoch, in geology, a subdivision of geologic time. Geologists divide the earth's history into eras, which are subdivided into periods. See more »

  • Jurassic Period
    Jurassic Period

    Jurassic Period, the geologic name given to the middle period of the Mesozoic Era, between the Triassic and the Cretaceous periods. See more »

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