chapter 9

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jtwebb
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267374
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chapter 9
Updated:
2014-03-21 16:01:10
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chapter 9
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chapter 9
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  1. geologic column
    Ordered arrangement of rock layers.
  2. Era
    Eons divided into smaller units of geological time.
  3. Periods
    Eras are divided into shorter time units.
  4. Epoch
    Divide a period into shorter time units.
  5. Evolution
    Is the gradual development of new organisms from preexisting organisms.
  6. Precambrian time
    Known as the formation of earth and ended about 542 million years ago
  7. Paleozoic Era
    ended about 251 million years ago.
  8. Mass extinction
    enormous amount of species died.
  9. Mesozoic Era
    ended about 65 million years ago.
  10. Cenozoic Era
    division of geologic time

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