This could go on for days. The condition of the rocks tell a story, too. Because of the chemical composition of the atmosphere, there is a change in the color of the surface of the rocks immediately after the drawings are made. The fresh surface of the rock is usually brighter in color whereas the older surface is much darker, writes Lehr in his book. The pictograph, another form of Indian rock art, is also prevalent in this region.
Pictographs are paintings, probably done with a feather, found in caves or other protected areas.
The colors most often used were reds, yellows, greens and blues. They learned how to plant seeds and how to make wine. Finding petroglyphs and pictographs to view is sometimes difficult. The location of the rock art is often not indicated, sometimes on purpose. There have been many instances of spray can and other graffiti defacing by teenagers of these drawings.