Chapter 9 Vocab

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Author:
asiron
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267361
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Chapter 9 Vocab
Updated:
2014-03-24 15:25:14
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Chapter Vocab
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Chapter 9
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Chapter 9 Vocab
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  1. Geologic Column
    An ordered arrangement of rock layers.
  2. Era
    Eons divided into smaller units of time.
  3. Period
    Eras divided into smaller units of time.
  4. Epoch
    Period divided into smaller units of time. The smallest unit of time.
  5. Evolution
    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
    Geologic Era that began about 542 million years ago and ended about 251 million years ago.
  8. Mass Extinction
    Episode which an enormous number of species died.
  9. Mesozoic Era
    Geologic Era that began about 251 million years ago and ended about 65 million years ago.
  10. Cenozoic Era
    Division of geologic time that began about 65 million years ago and that includes the present period.

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