This is where he was buried?

Under an oak tree.
We were passing through Wilson, Oklahoma 1964. On our way to my third year of college. We stopped in to see my dad’s mother, my grand mother who we just called Granny. She was Omie Ayers to her neighbors in Wilson.
My dad and I decided to stay a few days and rest a bit after the long road trip from Los Angeles. So, I decided to go down to the local drug store and buy a few paperbacks. One of which was Dr. Strangelove and read it non-stop for one day while laying atop a squeaky framed bed with an oscillating fan humming from across the room. It must had been at least 90-degrees outside. And almost the same inside.
But anyway, I finished the Strangelove book and was starting on a second when my Dad asked me if I would like to go with him to see where his dad, my grandfather Charlie Ayers was buried. Later we got in the car and my Dad told me his father is buried in a small area of Carter County called Simon. So, we drove south out of Wilson on a Countyline road for about 15-minutes and came to a gravel road, turned left, and proceeded to a spot which looked like a cow pasture. We passed through a wooden gate on foot, walked a few yards and came to another gate and made our way up inside. Then walked up a slight knoll to the shade of a large old Oak tree. I looked around and saw nothing that looked like headstones or burial monuments. We suddenly stopped and my Dad pointed straight down at a big rock half way buried in the ground. Then my Dad said here it is as he pointed at the rock. This is where my father was buried after he died back in 1933 during the great depression.
I must confess myself it is in a very peaceful setting. Almost sacred and like something John Steinbeck would describe in a novel. God rest my grandfather’s soul.