“Pennsylvanian”的概念、定义、翻译、参考文献-科学参考

单词	Pennsylvanian
释义	Pennsylvanian [¦pen·sal¦vā·nyǝn] ^GEOLOGY A division of late Paleozoic geologic time, extending from 320 to 280 million years ago, varyingly considered to rank as an independent period or as an epoch of the Carboniferous period; named for outcrops of coal-bearing rock formations in Pennsylvania.
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