The Trenton Prong is a section of the Piedmont province of what that was formed roughly 480 million years ago?
Appalachian Mountains: The Appalachian Mountains ( , French: "les Appalaches" ), often called the Appalachians, are a system of mountains in eastern North America. Appalachian Mountains:  The Appalachians first formed roughly 480 million years ago during the Ordovician Period.
i don't know