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geological eras

By deidarren
  • 4600 BCE

    Precambrian Era

    Precambrian Era
    The Precambrian Era started approximately 4.6 billion years ago and ended about 541 million years ago.
    • The Precambrian is the longest geological era, spanning almost 90% of Earth's history.
    • Continents began to take shape, Earth formed, and life appeared in the form of single-celled organisms during this era.
    • It ended with the Cambrian Explosion
  • 541 BCE

    Paleozoic Era

    Paleozoic Era
    541 million years ago to 252 million years ago.
    • During the Paleozoic Era various types of complex multicellular life forms appeared, such as fish, amphibians, reptiles, and insects.
    • Significant events in this period include the Cambrian Explosion, the migration of plants and animals to land, and the Permian-Triassic extinction event.
  • 252 BCE

    Mesozoic Era

    Mesozoic Era
    252 million years ago to 66 million years ago.
    • The Mesozoic Era, also known as the "Age of Dinosaurs," was a time when dinosaurs ruled as the biggest land animals.
    • It is split into three time periods: the Triassic, Jurassic, and Cretaceous.
    • The Mesozoic Era ended with the Cretaceous-Paleogene extinction event, causing the extinction of non-avian dinosaurs and numerous other species.
  • 66 BCE

    Cenozoic Era

    Cenozoic Era
    66 million years ago to present.
    • The Cenozoic Era is commonly known as the "Age of Mammals" due to the increase and control of mammal species.
    • The Paleogene, Neogene, and Quaternary periods make up the division.
    • Human evolution took place in the Cenozoic Era, hominids appeared around 7 million years ago, and Homo sapiens emerged around 300,000 years ago.