The Appalachian Mountains were formed during the Paleozoic era.

The Appalachians are among the world’s oldest mountain ranges, formed between 480 and 300 million years ago during the Paleozoic era. This period saw the collision of ancient continents, creating vast mountain chains. Over time, erosion reduced these towering peaks to their current form. Today, the Appalachians stand as a testament to Earth's dynamic geological history, showcasing layers of rock and fossils from the Paleozoic era.