David;

I have never been to Yarmouth, but I ran across an article about geocaching and the cemetery is listed on their website:

http://www.geocaching.com/seek/cache_details.aspx?guid=46f32...

Looks to be on Lake George Rd., about two miles north of South Ohio.

According to the website it is the same location as the Brenton Methodist Church.

Best Wishes,

Robert