I think I found the data on Family Search. I read that Van Buren, Mich. was the U.S. "Gretna Green". You could marry at age 18 there & that is how old Sarah was. I haven't looked at a map to see where it is located as yet but should as that may give yet another clue to where James +/or Sarah lived. They may have lived near enough prior to 1872 as they knew to go there to get married when you are young. ? You never know!
I found a site called Old Fulton Postcards that you may want to check out for data in Erie County & neighboring counties. I have found a lot of data from that site. It has newspaper extracts & is interesting to see.