I studied the occult pretty heavily in my younger years, some of these others you posted are alchemical or at least appear to be such. Possibly just cheesy new age graffiti, it's also possible it's a prank, likewise you may be in an area where the neo pagan community holds regular gatherings and some of them decided to put their mark on the rocks: look for a stone ring in the area, sometimes they have special ritual spots. This whole thing about treasure symbols carved randomly into rocks seems rather suspect to me, I want to see the epic treasures they supposedly point to, I have my doubts. I almost posted a prank photo of a rock formation I came across hiking the other day, it looked vaguely like a hippo's head with the tongue sticking out. Super secret treasure symbol! I decided not to because I didn't want to make fun but, yeah, take 'er with a grain of salt and don't assume the Spanish buried their gold anywhere in the area lol. These symbols probably refer to something other than treasure