From 310 million to 280 million years ago, warm climate, swampy land
English: Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period
Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period
English: Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period