Upper Carboniferous period

Từ điển WordNet v3.1 - WordNet Dictionary

noun

from 310 million to 280 million years ago;
warm climate;
swampy land
• Syn:
Pennsylvanian, Pennsylvanian period, Upper Carboniferous
• Instance Hypernyms:
period, geological period
• Part Holonyms:
Carboniferous, Carboniferous period