Rock art in the Southwestern U.S. dates back 3000 plus years. During these early years it was common for one people to respect the art of those who came before, even though they might be of different tribes, as many led transient lifestyles.
In this depiction, the inconsiderate and selfish nature of the modern day is accurately displayed by destructive individuals who's understanding is dwarfed by a people who lived hundreds or possibly thousands of years earlier.
Since earliest know time, Hueco tanks has been a junction for travelers, where year round water has allowed crossing the hostile environment of the desert. A rock hound paradise yes, but a world renowned rock climbing mecca. Northeast of Elpaso Tx
http://en.wikipedia.org/wiki/Hueco_Tanks
