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Pennsylvanian periodPennsylvanianUpper CarboniferousUpper Carboniferous periodgeological periodperiodCarboniferousCarboniferous period

Pennsylvanian period

noun

1 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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