Pictographs at Thompson Springs (August 20, 2018)

These painted pictographs (rather than chiseled in the rock, like petroglyphs) date back 4,000 years.  Who lived here?  Who painted these?  What did they use, that it would last 4,000 years???

I stood in front of the larger-than-life pictographs on the right.  More pictographs are to the left and above.

Papa Tom at the pictographs.