Geologic time

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Geologic time

  1. 1. One Million?
  2. 2. Geologic Time Scale <ul><li>Geologic time scale is a record of the life forms and geologic events in Earth’s History </li></ul><ul><li>Written from present to past </li></ul><ul><ul><li>Opposite of many of our timelines that we are used to </li></ul></ul>
  3. 5. Precambrian Time <ul><li>Geologic time begins with Precambrian time </li></ul><ul><li>Covers about 88% of Earth’s history </li></ul><ul><li>Ended 544 million years ago (mya) </li></ul><ul><li>After Precambrian time, the basic units of geologic time scale are eras, periods and epochs </li></ul>
  4. 6. Paleozoic Era <ul><li>Began about 544 mya </li></ul><ul><li>Lasted for 300 million years </li></ul><ul><li>Paleo means ancient or early, zoic means life </li></ul><ul><li>Most animals were invertebrates </li></ul>
  5. 7. Mesozoic Era <ul><li>Began about 245 million years ago </li></ul><ul><li>Lasted about 180 million years </li></ul><ul><li>Meso means middle </li></ul><ul><li>Often called the Age of Dinosaurs </li></ul><ul><li>Mammals began evolving in this era </li></ul>
  6. 8. Cenozoic Era <ul><li>Began about 65 million years ago </li></ul><ul><li>Continues today </li></ul><ul><li>Ceno means recent </li></ul><ul><li>Called the age of mammals </li></ul>
  7. 9. Periods <ul><li>Eras are subdivided into periods </li></ul><ul><li>Range in length from tens of millions of years to less than 2 million years </li></ul>
  8. 10. Epoch <ul><li>Periods of the Cenozoic Era are divided into epochs </li></ul><ul><ul><li>The fossil record of the Cenozoic Era is more complete so it makes it easier to divide it further </li></ul></ul>
  9. 12. Reflection page 46 <ul><li>Compare your personal timeline (“This is Your Life” Activity) with Earth’s timeline. What similarities and differences do you see? </li></ul>

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