Search Result：upper carboniferous period
upper carboniferous period 
(TTS Sound)
(TTS Sound)Overview of noun upper_carboniferous_period
The noun upper carboniferous period has 1 sense
- Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period -- (from 310 million to 280 million years ago; warm climate; swampy land)