Decorated boulders and other neglected features of the Central Saharan rock art

This paper focuses on previously neglected or unpublished rock art, and suggests that the simplest engravings are signs bearing their own meaning. When studied as a whole instead of being treated as isolated units without any relation to other forms of rock art, it emerges that grooves, ovals, cupules and Kel Essuf engravings were probably created following the same pattern.