Pennsylvanian period

Definitions of Pennsylvanian period
  1. noun
    the period of geologic time from about 323 to 299 million years ago; the sixth period of the Paleozoic era
    synonyms: Pennsylvanian, Upper Carboniferous, Upper Carboniferous period
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    example of:
    geological period, period
    a unit of geological time during which a system of rocks formed
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