| 单词 | Alleghenian orogeny |
| 释义 | Alleghenian orogeny [¦al·ǝ¦gān·ē·ǝn ȯ`räj·ǝ·nē] GEOLOGY Pennsylvanian and Early Permian orogenic episode which deformed the rocks of the Appalachian Valley and the Ridge and Plateau provinces. |
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