Despite driving by this tombstone everyday, I never noticed it was a tree stump. So I stopped, took a few photographs, and after some research, I discovered what a Woodman of the World Memorial is. (click these links for more info: Southern Graves and Woodmen of the World)
I also noticed that Mr. McIver is buried next to an ancestor (how did I not notice the tree stump headstone before?!)...and he shares the same last name as my ancestor's wife...and they died the same year. Could this stump be part of my family tree?? Sounds like a fun genealogy mystery to me!