There was surely a genealogist in the family when this tombstone was inscribed. Look, full dates and even a maiden surname: Ann WILSON. I've surmised for some time that John HARTLEY was related to my 2X great grandfather, William HARTLEY, who was buried at nearby Brisbin Cem, and who does NOT have a tombstone. So, as I started to follow the individuals back in time thru the British censuses (thanks to Ancestry.com), I discovered that William was born in 1823 in a small (~140 persons), rural village called Summerhouse, in Gainford Parish, County Durham, ENG. Then, in the 1841 and 1851 censuses, both William and John could be placed into the family of a William Hartley and Ann; indeed, VERY common names. But fortunately, Ann's mother, Elizabeth Langstaff, was also enumerated in the household. So, my pedigree jumped back another generation for the Hartley Line. Now, I can document that my 3X great grandparents were William Hartley, the Elder, and Ann LANGSTAFF. And of course, 2 of their 11 children were the confirmed brothers William and John Hartley, who immigrated to Houtzdale, Clearfield Co (William) or Philipsburg, Centre Co (John W.), PA. The challenge now is to learn the fate of the other nine children.
For a neat trip, go to Google Maps, satellite view, and zero in on England> County Durham in the north> and finally, Summerhouse. One can see the rural nature of the village, the old post office, and the old Methodist Chapel. See if this link will take you to Summerhouse hybid map at Google.
Or go to "Keys to the Past" which displays vintage and modern maps of Summerhouse, Gainford Parish, County Durham, England