This is not Teotihuacan, this is not Palenque. But most certainly, people who lived there left some soft of traces. Petroglyphs are most likely to be preserved, and once they are discovered, INAH gets involved. Once INAH gets involved, some money starts flowing. Not the type that daily bus-loads of gringos will bring, as in the most famous sites mentioned, but small amounts, intended on helping the "study and preservation" of the site. So please help propagate the imagery ( and the fame of the place) by recreating their artwork, as there is not much else they left behind.