The Polk County Cemetery book lists him with the dates you gave. I am not sure who read the cemetery for the book. I have an old reading and have seen his grave. His stone says-- William C. Cavin, Oct. 18, 1818--Nov. 5, 1901. Age 83 yrs 17 dys. He is in row 19 of the old part of the cemetery between Omer L Hankins and Herley S Cavin who was the son of W.M.&M.E. Cavin. Herley's dates are Nov. 7, 1894-Sept. 10, 1895. W. B. Cavin is buried next to Herley. His dates are 1837-1895. I notice you have William B and William C dates the same. Linda