What is the meaning of pennsylvanian period?

From 310 million to 280 million years ago; warm climate; swampy land.
- synonyms: Pennsylvanian, Upper Carboniferous, Upper Carboniferous period

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APA	WordNet. (2010). pennsylvanian period. Retrieved September 25, 2026, from http://smartdefine.org/pennsylvanian_period/definitions/1301068
Chicago	WordNet. 2010. "pennsylvanian period" http://smartdefine.org/pennsylvanian_period/definitions/1301068 (accessed September 25, 2026).
Harvard	WordNet 2010, pennsylvanian period, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/pennsylvanian_period/definitions/1301068>.
MLA	WordNet. "pennsylvanian period" 23 October 2010. Web. 25 September 2026. <http://smartdefine.org/pennsylvanian_period/definitions/1301068>

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