Pennsylvanian

[pen-suh l-veyn-yuh n, -vey-nee-uh n] /ˌpɛn səlˈveɪn yən, -ˈveɪ ni ən/

adjective
1.
of or relating to the state of .
2.
Geology. noting or pertaining to a period of the Paleozoic Era, occurring from about 310 to 280 million years ago and characterized by warm climates, swampy land areas, and the development of insects and reptiles: sometimes considered as an epoch of the Carboniferous Period.
noun
3.
a native or inhabitant of .
4.
Geology. the Pennsylvanian Period or System.
/ˌpɛnsɪlˈveɪnɪən/
adjective
1.
of the state of Pennsylvania
2.
(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 See also Mississippian (sense 2)
noun
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
adj.

1698, from Pennsylvania + -an. In reference to a geological system, attested from 1891. As a noun meaning “a person of Pennsylvania,” by 1685.
Pennsylvanian
(pěn’səl-vān’yən)
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.