Hi Toni, Didn't mean to sound petty about the name of the town. That was just a FYI.
Have you contacted the Sonoma County Clerk-Recorder's Office, sonma-county.org/recorder/aboutus.asp ? They MIGHT have Jack's birth record. Vital records weren't required in California until 1905 on a state level even though it became a state in 1850.
I searched Ancestry and FamilySearch and didn't find anything. Successful Searching!