Of all the common types of stones that you find in cemeteries, I find this one to be the most unusual. A lot of people don’t know what to call this variety of grave marker, but those who I have found classifying it often refer to it as a bolster, probably due to its resemblance to the pillow variety that bears that name.
I just don’t understand the logic that made someone decide to form a stone into a cylinder and then balance it horizontally on a stone base. Most of them date to the early to mid-20th century.