Appalachian orogeny Alleghenian Orogeny formed at the same time Alleghenian orogeny birth of the Appalachian Mountains Alleghenian orogeny birth of the Appalachian Mountains Alleghenian Orogeny birth of the Appalachian Mountains Alleghenian orogeny Alleghenian/Applachian orogeny Appalachian orogeny Appalachian orogeny