Stylized anthropomorphic figures of various types are also common, with a smaller number of canids/felines, snakes, weapons, and a few other identifiable designs.But simple and complex geometric designs are typical (roughly one-third of the total) and are frequently intermingled with the ostensibly identifiable images.Recent research in North and South America, including improvements in chronometric techniques, has amplified our understanding of Terminal Pleistocene/early Holocene art.
Unit dating controversy
More confidently, there is a consensus that the initial immigrants where behaviorally modern, in the archaeological sense of these terms (e.g., ).
A key attribute of archaeological modernity is the ability to conceptualize and employ symbols, including the capacity to make and use art .
The CR technique was developed by Dorn and first applied to petroglyphs in the early 1980s [24–27, 29–31, 35–38].
Though initially employed in the Americas, it was subsequently used in South America, Africa, Asia, and Australia (discussed below).
By the mid-1990s, three independent rock varnish dating techniques had been developed and applied to petroglyphs: cation-ratio (CR) dating, varnish microlamination (VML) dating, and AMS ; one result of which is the widespread but incorrect assumption among archaeologists that rock varnish dating as a whole is no longer viable .