Wiktionary
petrograph
n. Drawing, writing or inscription on stone, as a painting on a cave wall.
Usage examples of "petrograph".
Noguchi petrograph, which have now made, so to speak, hidden things visible to a depth of twenty-five miles, and there too he will find a description of a score of ingenious devices for isolating blocks of deep-lying rock and bringing their desirable ingredients to the surface.
There was a color petrograph of the 1,054 supernova which created the Crab Nebula.