English noun: Pennsylvanian period | |||
1. | Pennsylvanian period (time) from 310 million to 280 million years ago; warm climate; swampy land | ||
Synonyms | Pennsylvanian, Upper Carboniferous, Upper Carboniferous period | ||
Instance hypernym | geological period, period | ||
Part meronym | Carboniferous, Carboniferous period | ||