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Geologic Time


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Geologic Time

  1. 1. Geologic Time
  2. 2. Objective <ul><li>Describe the structure of the continents during these Eras </li></ul><ul><li>Compare the types of life forms present </li></ul><ul><li>Determine the types of extinctions that occurred at the end of each Era </li></ul>
  3. 3. Precambrian Era <ul><li>Enormous amount of time </li></ul><ul><ul><li>4 billion years (88% of Earth History) </li></ul></ul><ul><li>Life </li></ul><ul><ul><li>Mostly single celled organisms </li></ul></ul><ul><ul><li>Beginning of multicellular organisms </li></ul></ul><ul><ul><li>Mostly fossilized stromatolites </li></ul></ul><ul><li>Landforms </li></ul><ul><ul><li>Changed greatly </li></ul></ul><ul><ul><li>Most fossils found in metamorphic rock </li></ul></ul><ul><li>No extinction event </li></ul>
  4. 4. Paleozoic Era (Paleo = old/ zoic = life in Greek) <ul><li>Time </li></ul><ul><ul><li>248 mya to 540 mya (292 million years) </li></ul></ul><ul><li>Life (Explosion of life) </li></ul><ul><ul><li>Hard shells develop </li></ul></ul><ul><ul><li>Fish, Insects, Land plants, Reptiles, Amphibians </li></ul></ul><ul><li>Land </li></ul><ul><ul><li>Large land mass in south called Gondwanaland </li></ul></ul><ul><ul><li>Gondwanaland moves toward equator to form massive land mass “Pangaea” </li></ul></ul><ul><li>Extinction (global climate changes) </li></ul><ul><ul><li>Biggest in history (95% of all marine life species died out) </li></ul></ul><ul><ul><li>trees, fishes, amphibians, invertebrates (trilobites) </li></ul></ul>
  5. 5. Mesozoic Era ( Meso = Middle / Zoic = life in Greek) <ul><li>Time </li></ul><ul><ul><li>65 mya to 248 mya (183 million years) </li></ul></ul><ul><li>Life </li></ul><ul><ul><li>Dinosaurs </li></ul></ul><ul><ul><li>Birds </li></ul></ul><ul><ul><li>Flowering plants </li></ul></ul><ul><li>Landforms </li></ul><ul><ul><li>Pangaea breaks up to take on modern land appearance </li></ul></ul><ul><li>Extinction </li></ul><ul><ul><li>Massive (85% of all species die) </li></ul></ul><ul><ul><ul><li>All dinosaurs gone </li></ul></ul></ul><ul><ul><ul><li>Asteroid impact </li></ul></ul></ul>
  6. 6. Cenozoic Era (Ceno = Recent / Zoic = life) <ul><li>Time </li></ul><ul><ul><li>65 mya to now (65 million years) </li></ul></ul><ul><li>Life </li></ul><ul><ul><li>Age of mammals </li></ul></ul><ul><li>Land </li></ul><ul><ul><li>Modern continent positions </li></ul></ul><ul><li>Extinction </li></ul><ul><ul><li>Massive </li></ul></ul><ul><ul><li>Human caused </li></ul></ul>
  7. 7. Quiz
  8. 8. Homework Pick an Era and list important attributes