|1.||of the state of Pennsylvania|
|2.||See also Mississippian (in North America) of, denoting, or formed in the upper of two divisions of the Carboniferous period, which lasted 30 million years, during which coal measures were formed|
|3.||an inhabitant or native of the state of Pennsylvania|
|4.||the Pennsylvanian the Pennsylvanian period or rock system, equivalent to the Upper Carboniferous of Europe|
|Pennsylvanian (pěn'səl-vān'yən) Pronunciation Key
The sixth period of the Paleozoic Era, from about 320 to 286 million years ago. Rock deposits from this period of time alternate between being marine and terrestrial in origin, and are rich in coal. Reptiles first appeared in the Pennsylvanian Period. See Chart at geologic time.