It kinda looks like those seen in the Arabian Sea, (DOWS) or of Chinese origin (JUNKS). There is a lot of history lost in the world, and the knowledge we have today is directly attributed to those cultures who valued bureaucratic records...Roman/Greek, Arab, Chinese, etc. It's to bad the Catholic Church was so determined to stamp out Central and South American culture and religion, as the surviving Religious texts are only a small percentage of what was lost or destroyed. To the victors, go the spoils, and who write History, is so true in this world.
That rock drawing is amazing, as you pointed out. 500 Miles inland, so you know trade and knowledge flowed across the continent. Here in the USA, along the Southern border area, there are reminders of how far North influences were. There were discovered 1 or 2 ? 'ball courts' that were directly copied from the Aztecs of Central Mexico. Also Sea shells from the Pacific Shore, 300 miles inland near the cliff dwelling people. As was turquoise stones in the New Mexico/Arizona area found on our west coast, showing how trade routes were open on this continent.