This coal-forming period of geologic time is split into Mississippian & Pennsylvanian periods
"The Coal 
Age"... [DOC] [TLE] Geologic History of Georgia: Overview | New Georgia Encyclopedia [PAR] During this time, the formation and erosion of mountain ranges, dramatic ... 
Period, and Silurian Period; Devonian Period; Mississippian Period; 
Pennsylvanian Period ... Geologic time is divided into eras, periods, and epochs, 
and these time units ... 630 and 700 million years ago, the rifting (or splitting apart 
of the continent)... [DOC] [TLE] Paleozoic Era Paleobiology - The Virtual Fossil Museum [PAR] The Paleozoic Periods: Cambrian Ordovician Silurian Devonian Carboniferous 
Permian ...