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Sci. 3-5 Times Marches On Pages 73-77

Discover the fascinating history of Earth through its rock layers. This article explores the geologic time scale, which divides Earth's 4.6 billion-year history into distinct intervals. Learn about the eons, eras, periods, and epochs that mark major milestones in our planet's past. From the Hadean Eon to the recent Cenozoic Era, uncover the evolution of life on Earth through this captivating journey.

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Sci. 3-5 Times Marches On Pages 73-77

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  1. Sci. 3-5 Times Marches On Pages 73-77

  2. The history of the Earth is recorded in rock layers • 1) Earth is about 4.6 billion years old.

  3. The geologic time scale- a scale that divides Earth’s 4.6 billion year history into distinct intervals of time.

  4. C. Eons- largest division of time 1) Hadean Eon 2) Archean Eon 3) Proterozoic Eon 4) Phanerozoic Eon

  5. Eras- the eons are divided into eras.

  6. Phanerozoic Eon has 3 eras. • Paleozoic- no land animals at the beginning, mostly water animals, toward the end- some land animals and amphibians and insects. • Mesozoic- Age of the Reptiles- Dinosaurs, some small mammals and birds • Cenozoic- recent life- Age of mammals, humans show up here.

  7. Periods- Eras are divided into Periods. • 1)Paleozoic has 7 Periods. • 2) Mesozoic has 3 Periods. • 3) Cenozoic has 2 Periods.

  8. F. Epochs- Cenozoic has the periods divided into epochs because we have some much information about this Era.

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