Appalachian orogeny

Appalachian orogeny

[¦ap·ə¦lā·chən ȯ′räj·ə·nē]
(geology)
An obsolete term referring to Late Paleozoic diastrophism beginning perhaps in the Late Devonian and continuing until the end of the Permian; now replaced by Alleghenian orogeny.
References in periodicals archive ?
These ages suggested that: 1) the massif had an Ordovician metasedimentary basal unit, dated with trilobites; 2) At the end of the Appalachian orogeny (that began 360 Ma and finished approximately 270 Ma ago), the granitoids were emplaced in the metasediments as a post orogenic event.
The Mogote Granite was intruded during the Taconic orogeny whereas the Mata Oscura and Pinero granites, as well as the Corcovado and Segoviera rhyolites, fall at the end of the Appalachian orogeny.
2) Rocks of Early Permian ages (Pinero and Mata Oscura granites) were emplaced at swallow depth of the cortical block, in a relatively quiescent period at the end of the Appalachian orogeny, together with an Early Permian rhyolitic lava flow event of the Guacamayas volcanics, therefore they both could be part of the same mayor igneous event, emplaced in deep to shallow environments.
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