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Definitions of pennsylvanian period
Definition that contains pennsylvanian period
  • order cordaitales extinct plants having tall arborescent trunks comparable to or more advanced than cycads; known from the Pennsylvanian period; probably extinct since the Mesozoic era
  • cordaitales extinct plants having tall arborescent trunks comparable to or more advanced than cycads; known from the Pennsylvanian period; probably extinct since the Mesozoic era
  • myxinikela siroka fossil hagfish of the Pennsylvanian period (c. 300 million years ago) that resembled modern hagfishes
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