Original sentence: Approximately 700 million years after the Greenville Oregny, the Iapetus Ocean began to close resulting in the Alleghenian Orogeny when the Old Rag Granite and layers of rock deposited upon it where transported westward and eventually thrust up over the limestone bed around it, forming Old Rag and the Blue Ridge Mountains
Edited sentence: Approximately 700 million years after the Greenville Orogeny, the Iapetus Ocean began to close resulting in the Alleghenian Orogeny when the Old Rag Granite and layers of rock deposited upon it where transported westward and eventually thrust up over the limestone bed around it, forming Old Rag and the Blue Ridge Mountains