Joseph Barkley is not buried by Laura, and I can't find him in any Lewistown Township cemetery. He could, of course, be buried elsewhere in Fulton County. There are 25? other townships, but I don't have those inscription books.
Section/Plot numbers are not given for McNeil Cemetery so I can't even tell you by whom Laura is buried. Her listing reads simply:
BARKLEY, Laura Ann, wf of Joseph G. d. June 20, 1874 34y 25d