I checked for your Powers in the Tombstone Inscriptions for the Bradley Cemetery by Raymond and Steven Bradley from 1966 - there were 2 headstones that may match:
In Memory of Robert who died 1843 in his 44th yr - 6 mos.
In memory of Mary wife of Robert
I don't know if this is any help, just wanted to pass it along. My mother and I visited the cemetery about 4 years ago. The lady who owned the land, Mrs. Watson, said that she still gets a number of visitors to the cemetery. Good luck in your search! -- Heather Leesman