I have good news for you in case you don't already know since you posted this 4 years ago. The cemetery you are looking for is not paved over. I believe there is a cemetery connected to the Cantley family that has been paved over and made into a boat landing but this is not the cemetery you are looking for. I don't know how you are related to the 2 individuals that you mentioned in your first post but they are buried in a cemetery called the Old Cantley Burial Ground. There are people from 2 families buried there. One is obviously the Cantley family and the other is the Mitchum family. My great great grandfather and great great grandmother are buried there as is one of their sons and his family. If I remember correctly it is located in the woods between Doc Kellahan Road and Richland Avenue off the Thurgood Marshall Hwy in Williamsburg County. These are roughly its GPS Coordinates: Latitude: 33.58440, Longitude: -79.68709. Hope this helps and you are able to go see it.