Alleghenian orogeny

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Alleghenian orogeny

[¦al·ə¦gān·ē·ən ȯ′räj·ə·nē]
(geology)
Pennsylvanian and Early Permian orogenic episode which deformed the rocks of the Appalachian Valley and the Ridge and Plateau provinces.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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