When were the Appalachian mountains formed?

The Appalachian mountains were formed over hundreds of millions of years through a series of geological events. The initial formation of the Appalachian Mountains began about 480 million years ago during the Ordovician period, when the collision of the North American and African tectonic plates created the supercontinent of Pangea. This collision resulted in the uplift of the Earth's crust and the formation of mountain ranges. Over time, the mountains were further shaped by erosion, glaciation, and other geological processes. The final uplift and shaping of the Appalachians occurred during the Appalachian orogeny, which took place about 250 to 300 million years ago, during the late Paleozoic era.