Pennsylvanian period

Từ điển Oxford Learners Wordfinder Dictionary

noun

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