possible background reading ... via feuilleton, john coulthart's fountain of knowledge and fun
http://www.johncoulthart.com/feuilleton/2015/05/23/more-trip-texts/ http://www.johncoulthart.com/
Posts
little petroglyph canyon
http://www.independent.com/news/2015/apr/20/little-petroglyph-canyon/ https://youtu.be/bBu0wFv2nI4