noun
from 310 million to 280 million years ago; warm climate; swampy land
• Instance Hypernyms: ↑period, ↑geological period
• Part Holonyms: ↑Carboniferous, ↑Carboniferous period
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Geol.
Pennsylvanian (defs. 2, 4).
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Upper Carboniferous,
Geology. the name outside of North America for the Pennsylvanian period of Carboniferous time.
Useful english dictionary. 2012.