It is the Appalachian Mountians. Which consist of: Taconic
Orogeny (Ordovician);Acadian Orogeny (Devonian);Caledonian Orogeny
(Silurian); Allegheny Orogeny (Pennsylvanian & Permian).
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The Acadian arc system impacted the North American Continent
(Laurentia) along the eastern seaboard. This collision along with
that of the earlier Taconic arc system resulted in the creation of
the Appalachian and Ouachita orogeny's.