| 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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