ch9

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Author:
dhoewing
ID:
267333
Filename:
ch9
Updated:
2014-03-24 10:50:19
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Ch9
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Ch9
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Ch9
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  1. geologic column
    A order of arrangment of rock layers by reltive age
  2. era
    a unit of geologic time that includes two or more periods
  3. periods
    a unit of geologic time that is longer than an epoch but shorter than an era
  4. epoch
    a subdivison of geologic time that is longer than an age but shorter than and period
  5. evolution
    the process of change by which new species develop from preexisting species over time
  6. percambrian time
    the interval of time in geologic time scale from earths fromation
  7. palezoic era
    the geologic era that followed precambrian time and that lasted ftom 542 million to 251 million years ago
  8. mass extinction
    an episode during which large numbers of species became extinct
  9. mesozic era
    the geologic era tha last from 251 to 65.5 million years ago
  10. cenozoic era the current geoglic era which began 65.5 million years ago

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