Thank you ever so much. I have contacted the cemetary. They checked their records, and they even walked the section for me (you're right; they were exceedingly helpful). There are one or more unmarked graves at the edge of one section that aren't on their list; the individual I contacted presumed the grave may be one of my relatives.
Sarah H. Ward Temple seems to be a likely candidate for the undocumented gravesite. Her son Andrew P. Temple perished in 1902 near Scotia, and is reportedly buried in Ocean Side. She is shown in Hydesville living with her two brothers William John Ward and Edwin D. Ward during the 1900 census, but is not listed as a surviving relative on 1 June 1901 when Edwin dies in Eureka.