Lt. Tim Lyons, a police spokesman, said Thursday morning that he had no updates in the case.
The Petaluma Argus-Courier reported county coroner's officials expect it will be another month before anything is known.
The woman's body was found fully clothed and decomposing on the privately owned piece of land near Steamer Landing Park; officials previously said it appeared she had been there since June.
Police don't consider her death suspicious.
Anyone with information about this incident is asked to call the Petaluma Police Department at 707-778-4372. If you wish to remain anonymous you may call PPD Crime Tips at 707- 781-1200 or email firstname.lastname@example.org.