Appalachian orogeny

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  1. Late Paleozoic Era diastrophism beginning perhaps in the Late Devonian Period and continuing until the end of the Permian Period. AGI
  2. A period of intense mountain-building movements in the late Paleozoic Era, during which the deposits in the Appalachian and Cordilleran geosynclines were folded to form the Appalachian and Palaeocordilleran mountains. Equivalent to the Armorican and Hercynian movements in Europe. Syn: Appalachian revolution
    Source: Dictionary of Mining, Mineral, and Related Terms