I've noticed that there are very few markers left for those who lived in the 1700's in Lancaster Co., including those born in the 1700's who died in the 1800's.? Maybe that is the case too with other counties as well.? Perhaps markers were originally wooden and rotted?? Or perhaps more elaborate stones were constructed by professional stone carvers?in the 19th century and later.? Several cemeteries' transcriptions?will make mention of markers, head and foot stones that are illegible or have no visible remaining characters on them. So if you do not find a marker for a person who once lived in the 1700's in Lancaster Co. don't presume they weren't buried there. Richard B.