These engravings may not be there forever because of erosion by blowing sand. I am glad we were able to see the llamas and symbols carved into the sides of the mountains. These ancient people were very fond of using hallucinogenics, so some of their carvings were a little "creative"- like the two headed llama, etc.
I did not know, but nothing decomposes in the desert because of the lack of moisture. If we had left an orange peel there, it would still be an orange peel years from now. The human waste of long ago is still there (YUCK!), and everywhere we went, we picked up any paper or garbage we saw to preserve this wonderful place.
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