I went out again today and spent alot of time looking at every standing or visible headstone . There was only one Ferguson, a John Ferguson and a 'Charity wife of Robert W ... ' and a couple others that are probably children . If F.A.G. is correct the date is 1782 - 1867 for the John Ferguson Its a bit odd to have 5 names on a headstone of that type and size so it will need a 3rd look and some tracing paper kind of investigation . The headstone is extremely worn and barely legible . If you think this is what your after I will be happy to go back and decipher the whole headstone .