What is the meaning of upper carboniferous?

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

|15 years ago|834 views|share |citing

APA	WordNet. (2010). upper carboniferous. Retrieved September 25, 2026, from http://smartdefine.org/upper_carboniferous/definitions/1318468
Chicago	WordNet. 2010. "upper carboniferous" http://smartdefine.org/upper_carboniferous/definitions/1318468 (accessed September 25, 2026).
Harvard	WordNet 2010, upper carboniferous, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/upper_carboniferous/definitions/1318468>.
MLA	WordNet. "upper carboniferous" 23 October 2010. Web. 25 September 2026. <http://smartdefine.org/upper_carboniferous/definitions/1318468>

Definition by