I went to that same cemetary on Thursday. I did not find Isaac either. I have a feeling that he maybe buried there due to alot of the graves being unmarked. It also seems that alot of Marshall and John's siblings are there as that the years are close together. I noticed as well the last name of Aaron. That is Marshall's wife Mary's maiden name. It is possible that her family is there as well. As for the "old Athens Cemetary" I talked to the keeper of Oconee hills Cemetary some time ago. He had a map of the entire Oconee hills Cememtary and made no mention of another part of it somewhere else. It is however divided from Old and new. But it is not seperated by a road. There is a River that runs through the land but it doesnt seperate the age of the cemetary. My grandparents ( Marshall, Lemuel and Walter and their wives) are buried in the old part of the cemetary. There is a Charles S(?) Pledger, that is also buried in the old part, but at another location. He is for the most part buried by himself. My father is going to contact the minister of the church (since he is also a Methodist minister) and see if he can get any information on the Princeton graveyard.I will let you know if I find out anything.