If you look at the Caldwell County website, under Cemeteries, click on Mound Chapel, it indicates it was established 1881. It also says "M.E. South" Church. It lists names of those buried there. My dad always said it was Presbyterian. I grew up in Caldwell County and know of no other Presbyterian Church in the county. You might contact the headquarters of Presbyterian Churches in MO and see what their records might have. Somewhere in a box of old photographs are some pictures taken there.