There are easily recognizable images of known dinosaur types on canyon walls and cliffs in North America and such signs used to be more common than they are now. Particularly the stegosaur ("Mishipishu" in Ojibway language, or 'water panther'), Lewis and Clark said their Indian guides were in mortal terror at the sight of those glyphs since the original meaning had been "Caution, one of these things LIVES here". Indian oral traditions (see Vine DeLoria's "Red Earth, White Lies") describe Mishipishu as having red fur, a catlike face, a sawblade back and a "great spiked tail" which he used as a weapon, i.e. as a stegosaur.
Most of the remaining such glyphs are stick figures although all show the dorsal spikes, but the one at Agawa Rock at Lake Superior (Massinaw) is not a stick figure image:
I'm aware that stegosaurs did not have horns... Indians have always touched those glyphs up every few decades and the horns were added by such a touch-up artist who figured a creature that size needed them, long after the animal was extinct.