Chapter 9 vocabulary

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  1. Geologic Column
    Ordered arrangement of rock layers.
  2. Era
    Eons divided into smaller units of geologic time.
  3. Periods
    Eras are divided into shorter time units.
  4. Epochs
    Divide a period into shorter time units.
  5. Evolution
    The gradual development of new organisms for preexisting organisms.
  6. Precambrian Time
    Time interval that began with formation of Earth and ended about 542 million years ago.
  7. Paleozoic Era
    Began about 542 million years ago and ended about 251 million years ago.
  8. Mass Extinction
    An enormous number of species died.
  9. Mesozoic Era
    Began about 251 million years ago and ended about 65 million years ago.
  10. Cenozoic Era
    The division of geologic time that began about 65 million years ago and includes the present period.
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Chapter 9 vocabulary
Chapter 9
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