badlands: The cache is long gone. Seems they put in a new driveway and cleaned up the grounds.
This cache was a bit esoteric but it amused me.
The key to this field puzzle was at the posted coordinates where the "family" name was "Riddle"
The son in law was born in 1815
202 feet at 35 degrees
The cache container was a bison on a post (boundary marker) in the northwest corner of the cemetery.
Thanks to everyone who came out!