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