pennsylvanian period

1 definition found

pennsylvanian period - WordNet (r) 2.1 (2005) :

  Pennsylvanian period
      n 1: from 310 million to 280 million years ago; warm climate;
           swampy land [syn: Pennsylvanian, Pennsylvanian period,
           Upper Carboniferous, Upper Carboniferous period]