The sandstone has kept intact the traces and marks of the major ... their vestiges date back to several hundreds of thousands of years. The rock art of Tassili n'Ajjer, is the most eloquent expression ...

While there are hundreds of inscribed petroglyphs at the White Mountain Petroglyph Site north of Rock Springs, the deep ...

Archaeologists discovered carvings on an ancient sandstone that depicted a hunter ... "When Maria came to me with the rock art photos and asked me if they meant anything, I about lost my mind ...