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Geologic time scale

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  • 1. The Geologic Time Scale
  • 2. Fossil Record
    • The dating of all fossils is included in the Geological Time Scale. This scale divides the time that the earth has existed into 4 eras.
    • Eras are then divided into periods based on common events in that time period.
  • 3. Pre-Cambrian
    • Began with the formation of the Earth 4.6 billion years ago.
    • Bacteria appeared 3.5 billion years ago, followed by algae and fungi.
  • 4. Paleozoic Era
    • Divided into 5 periods:
    • Cambrian Period - Sponges, snails, clams and worms evolve
    • Ordovician Period - First fishes evolved and other species become extinct
    • Silurian Period - Land plants, insects and spiders appear
  • 5.
    • Devonian Period - Amphibians evolve and cone-bearing plants start to appear.
    • Carboniferous Period - Tropical forests appear and reptiles evolve.
    • Permian Period - Seed plants become common and insects and retiles become widespread. Sea animals and some amphibians begin to disappear.
  • 6. Mesozoic Era
    • Divided into 3 periods:
    • Triassic Period - Turtles and crocodiles evolve and dinosaurs appear.
    • Jurassic Period - Large dinosaurs roam the world. First mammals and birds appear.
    • Cretaceous Period - Flowering plants appear, mammals become more common, dinosaurs become extinct.
  • 7. Cenozoic Era
    • Divided into 2 periods:
    • Tertiary Period - First primates appear and flowering plants become the most common.
    • Quaternary Period - Humans evolve and large mammals like woolly mammoths become extinct.
  • 8. ASSIGNMENT Create a poem to remember the Geologic Time Scale, eras, periods,