The eminent local historian Father Michael Fisher postulates that this crop of rock might have been the very cave that once housed the seventh century Saint Chad. Chad was, for a while, a hermit in these woods near Salt Village.
The soil must have risen quite a lot, I suppose, as you couldn't fit a cat in there now. However, the people behind the Two Saints Way pilgrimage trail, which runs north-south across Staffordshire, also seem to like the story.
The cave is at Ordinance Survey reference SJ 953 273, just off the public footpath.