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The geologic time scale divides Earth’s history based on major past events.

The geologic time scale divides Earth’s history based on major past events. Earth formed about 4.5 billion years ago!. Index fossils can provide the relative age of a rock layer. existed only during specific spans of time occurred in large geographic areas. fusulinids. trilobites.

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The geologic time scale divides Earth’s history based on major past events.

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  1. The geologic time scale divides Earth’s history based on major past events.

  2. Earth formed about 4.5 billion years ago!

  3. Index fossilscan provide the relative age of a rock layer. • existed only during specific spans of time • occurred in large geographic areas fusulinids trilobites

  4. The geologic time scale organizes Earth’s history.Divided into eons, eras, periods, and epochs. Precambrian 4.5 bya – 544 mya Oldest rocks/fossils Origin of eukaryotes Cyanobacteria 88% of geologic time

  5. Paleozoic “ancient life” 544-248 mya, fish, arthropods, amphibians, reptiles • Mesozoic “middle life” 248-65 mya reptiles, dinosaurs, birds, small mammals, fish • Cenozoic “recent life” 65 mya –present mammals, primates, fish, birds

  6. We live in the Quaternary period of the Cenozoic era

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