The first mountains were formed in North Carolina. Called the Grenville Mountains, they eroded long ago, but rocks formed at this time lie underneath the Appalachians and are exposed in parts of the Piedmont and Coastal Plain.
670,000,000 BC - 542,000,000 BC
Fossilized tracks of primitive worms have been found in those volcanic rocks.
End of Proterozoic Eon
Paleozoic - Cambrian
542,000,000 BC - 488,000,000 BC
542: The Kings Mountain Belt was formed about 540 million years ago as the Piedmont slowly moved into the rest of the continent.