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Not much rain in some deserts. In Utah you can see lots of similar carvings that are 1000 + years old. Those do look pretty clean though.

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My bad the article said seasonal rains, not torrential. We have stone carvings in scandinavia too but I assumed sandstone was much more susceptible to weather. If not the rain then wind and sand alone over 8000 years would wear it out.

Ancient humans probably knew this too because many examples of carvings and paintings were made in places protected from the elements, like caves and overhangs. They probably also decorated more exposed areas that haven't survived as well, as you note.

Mesa Verde as one example includes such cultural works dating back to 600CE. https://www.nps.gov/meve/index.htm

>many examples of carvings and paintings were made in places protected from the elements, like caves and overhangs

But how can we know if that was deliberate or a result of natural erosion weeding out the covered carvings from the uncovered?

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