25,000,000,000 mya - 542,000,000 mya
Neoproterozoic - 10,000,000,000 mya:
The land under North Carolina was pulled apart, and inland seas emerged. Island volcanoes developed, first along the North Carolina-Virginia border, then in an arc from Virginia to Georgia. Rocks formed by those volcanoes extend today over a wide area of the Piedmont and Coastal Plain.
Mesoproterozoic - 13,000,000,000 mya
bout 1,300 million years ago, 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.
Paleoproterozoic - 17,000,000,000 BC
About 1700 million years ago, the land that would become North Carolina began to form.