'This coal-forming period consisted of 2 portions:  Pennsylvanian & Mississippian'
Carboniferous
PREHISTORIC TIMES: This coal-forming period consisted of 2 portions:  Pennsylvanian & Mississippian
This coal-forming period consisted of 2 portions:  Pennsylvanian & Mississippian
This coal-forming period consisted of 2 portions:  Pennsylvanian & Mississippian
PREHISTORIC TIMES
Carboniferous
PREHISTORIC TIMES