designating or of the second and last geologic subdivision of the Carboniferous Period, characterized by the development of vast deposits of dead, coal-forming plant matter and the first conifers and reptiles
a person born or living in Pennsylvania
See Pennsylvanian in American Heritage Dictionary 4
Of or relating to Pennsylvania.
Of or belonging to the geologic time, system of rocks, or sedimentary deposits of the sixth period of the Paleozoic Era, characterized by the development of the amniotic egg, the appearance of the first reptiles, and widespread swamp forests. See Table at geologic time.
A native or resident of Pennsylvania.
The Pennsylvanian Period. Also called Upper Carboniferous.