I was at Hilltop Cemetery a few years ago and saw some Clodfelters buried there. Near Noah's grave there was a sunken area that we thought might be where William Nathan and Matilda are buried. From the above website I found the following:
Clara E. Clodfelter Sep 5, 1846-Aug 6, 1932 Mother
Noah O. Coldfelter Jun 17, 1843-Jul 20, 1907 Father He died as he lived a Christian
Clarence V. Clodfelter 1897-1944
Clodfelter Nov 1, 1907-Nov 5, 1907 Son of C.V. & A.M.
Clodfelter Jul3-Sep 25, 1904 Daughter of C.V. & A.M.
D.H. Clodfelter Mar 1, 1853-Dec 10, 1895 Gone but not forgotten
Clodfelter Nov 1-5 1907 Son of G.U. and A.M. Coldfelter
Clodfelter Jul 3-Sep5, 1904 daughter of G.U. & A.M. Clodfelter
B.H. Clodfelter Mar 4, 1853-Dec 5, 1894 Gone but not forgotten
The Clodfelter family was living in the Independence area during the time that William Nathan and Matilda passed away - so Hilltop would probably be the place they would be burried.
On a related note - not sure why William Nathan is sometimes refered to as Nathan William.