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Definition of Pennsylvanian period
1. Noun. From 310 million to 280 million years ago; warm climate; swampy land.
Exact synonyms: Pennsylvanian, Upper Carboniferous, Upper Carboniferous Period
Group relationships: Carboniferous, Carboniferous Period
Generic synonyms: Geological Period, Period
Group relationships: Carboniferous, Carboniferous Period
Generic synonyms: Geological Period, Period
Lexicographical Neighbors of Pennsylvanian Period
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