It seems obvious that markings made on sun-darkened rock,
laboriously chipped into the surface with another rock, would be a way to
communicate with others who were not there at the moment, such as the indicator of a spring behind a stone, or a place to look from to see clearly, or the record of an event that occurred nearby.
It also seems obvious that images made in stone in this way are ART, using keen observation of the shape and characteristics of animals and translating that into lines and shading, using the natural dots and bumps of the rock as visual elements in the drawing.
So is it Rock Art or Rock Signage or both?