After finding this marriage record

Details For Marriage ID#585913
Groom Last Name: JAMESON
Groom First Name: Robert S.
Groom Residence:
Bride Last Name: THEOBALD
Bride First Name: Susan
Bride Residence:
Place: Sheldon
Date: 18 Apr 1872
County of Record: Del Norte
State: California
Volume: 8 ISSUE 6
Page: 582-584
Comment: WT=Washington Territory: From Overland Monthly & Out West Magazine

I'd love to learn where Sheldon was. Any information you're able to provide will be greatly appreciated!