01 prop. n. The geological period from 280 million to 310 million years ago; -- it was characterized by a warm climate and abundance of swampy land.
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1.
The geological period from 280 million to 310 million years ago; -- it was characterized by a warm climate and abundance of swampy land.
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2.
A resident of the state of Pennsylvania.
Syn.
Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period.