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pennsylvanian period
 
Noun pennsylvanian period has 1 sense
  1. Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period - from 310 million to 280 million years ago; warm climate; swampy land
    --1 is a kind of period, geological period
    --1 is a part of Carboniferous, Carboniferous period
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