What’s that on the flat rock?

As intriguing as the rocks themselves are at the Valley of Fire State Park in Nevada, when we visited on October 24th we found that some of them also offer up traces of human activity from bygone ages. Click the excerpt below for a much-magnified look at the details on the flat rock.

I wonder whether the ancient inhabitants darkened the surface of this rock so they could scrape it away to create those orange glyphs.

© 2016 Steven Schwartzman