Newspaper Rock is a petroglyph panel etched in sandstone that records perhaps 2,000 years of human activity in the area. Etched into the desert varnish are symbols' representing the Fremont, Anasazi, Navajo and Anglo cultures. The exact nature of these symbols meaning is still not clearly understood. But they are typical of many sites throughout the U.S. in their use of universal symbols, be it graffiti or a true "newspaper," recording events of the times and earlier.

Source: Wikipedia