Chapter 9

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bfoster
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267324
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Chapter 9
Updated:
2014-03-24 09:17:53
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  1. Geologic column
    A time line of earths history
  2. era
    An eon divided into smaller units of time
  3. period
    Eras divided into smaller units of time
  4. Epochs
    a period divided into a smaller unit of time
  5. Evolution
    the gradual development of new organisms from preexisting organisms
  6. Precambrian time
    the time interval that began with the formation of earth and ended about 542 million years ago
  7. paleozoic era
    the geological era that began about 542 million years ago and ended about 251 million years ago
  8. mass extinction
    an enormous number of species dead
  9. mesozoic era
    the geologic era that began about 251 million years ago and ended 65 million years ago
  10. Cenozoic era
    the division of geological time that began about 65 million years ago and that includes the present period

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