a. Late Paleozoic Era diastrophism beginning perhaps in the Late Devonian
Period and continuing until the end of the Permian Period. AGI
b. 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
Dictionary of Mining, Mineral, and Related Terms