chapter 9

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Author:
lhatfield
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267375
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chapter 9
Updated:
2014-03-25 11:38:06
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chapter 9
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chapter 9
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  1. geologic column
    a geologic column represents a timeline of earths history.
  2. era
    an era is an eon split into smaller units.
  3. period
    a period is an era split into smaller units.
  4. epoch
    an epoch is a period split into smaller units.
  5. evolution
    evolution is the gradual development of new organisms preexisting
  6. Precambrian time
    The time interval that began with earths formation and ended about 542 million years ago.
  7. Paleozoic era
    The geologic era that began about 542 million years ago and ended about 251 million years ago
  8. Mass extinction
    The disappearance of Jurassic animals.
  9. Mesozoic era
    Earths surface started to change
  10. Cenozoic era
    The division of earths that began about 65 million years ago

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