Stone Bird.
Image of bird incised on stone darkened by desert polish.
Undeciphered petroglyph that may be directions or a map.

It seems obvious that markings made on sun-darkened rock,

Petroglyphs that suggest star maps.

laboriously chipped into the surface with another rock, would be a way to

Dog or coyote petroglyph
Petroglyph in shape interpreted as a dog or coyote figure with claw and extended head feature.

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?