What is the meaning of upper carboniferous period?

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

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APA	WordNet. (2010). Upper Carboniferous period. Retrieved September 25, 2026, from http://smartdefine.org/upper_carboniferous_period/definitions/1318469
Chicago	WordNet. 2010. "Upper Carboniferous period" http://smartdefine.org/upper_carboniferous_period/definitions/1318469 (accessed September 25, 2026).
Harvard	WordNet 2010, Upper Carboniferous period, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/upper_carboniferous_period/definitions/1318469>.
MLA	WordNet. "Upper Carboniferous period" 23 October 2010. Web. 25 September 2026. <http://smartdefine.org/upper_carboniferous_period/definitions/1318469>

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