Exactly so, when the parish have to pay for the gravestone and the burial as well, it stands to reason that everything is covered as this stone shows, but with minimal outlay. Probably, no coffin, just a calico winding, starts deep in the ground and upward, probably only a foot or so below the ground level for the last incumbent.
I was told all this by the grave digger at the churchyard I visited in Norfolk years ago.....