- Pennsylvanian period as a noun:
- 1
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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noun
From 310 million to 280 million years ago; warm climate; swampy land.
synonyms: Pennsylvanian, Upper Carboniferous, Upper Carboniferous period.
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