Petter Iversen death record 1903

Source information: Østfold county, Vestre Fredrikstad, Parish register (official) nr. I 8 (1902-1936), Death and burial records 1903, page 8. Permanent pagelink: http://www.arkivverket.no/URN:kb_read?idx_kildeid=25952&idx_id=25952&uid=ny&idx_side=-12 Permanent imagelink: http://www.arkivverket.no/URN:NBN:no-a1450-kb10040910010013.jpg line #32 is the death record of Peter Julius Iversen. I am not sure what this says other than he died May 28, and was buried June 3rd? Is there any value in looking for gravestones in Norway? Do families typically get buried together at this time? Wondering if his children/grandchildren are buried with him or if any family still takes care of the graves and how to find that out. I have had some luck in the USA finding the current owners of old cemetery plots and getting information from them Thanks David