Etymology
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Pennsylvanian

by 1685 (n.) "a person of Pennsylvania;" by 1698 (adj.) "of or pertaining to Pennsylvania," from Pennsylvania + -an. In reference to a geological system, attested from 1891.

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Definitions of Pennsylvanian

Pennsylvanian (n.)
from 310 million to 280 million years ago; warm climate; swampy land;
Synonyms: Pennsylvanian period / Upper Carboniferous / Upper Carboniferous period
Pennsylvanian (n.)
a native or resident of Pennsylvania;
Synonyms: Keystone Stater
From wordnet.princeton.edu