This is a map showing the past location of the Green Oak Cemetery which was bounded by Market, Mission, 8th and 7th Streets for a number of years beginning around 1849 or 1850.* (It was advertised in a newspaper, the Daily Alta California, on January 4th, 1850). I am not sure where they were moved to next. The city's Golden Gate Cemetery is a good bet.
San Francisco Cemeteries Page Maps Articles

* San Francisco Cemeteries, by Brian Bonne Mavrgeorge, May 1999. Presentaion at the California Genealogical Society Annual Fair 2.