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The Holocene Wet Phase, as it is called, fluctuated greatly between humid and dry periods and then reverted to a more consistent arid condition around 3800 BCE, as the rain belt retreated southward (Parker et al. The oldest known petroglyphs in Saudi Arabia are believed to date to the Neolithic period or Early Arabian Pastoral, which appears to coincide with at least part of the Holocene Wet Phase.These images are typically carved or pecked deeply into the rock surface.The hunter is usually aided by a pack of hunting dogs.
In that case, it may be possible to discern a minimum age for the art because its creation had to precede the archaeological deposit covering it.Compared to subsequent periods, the older Holocene Wet Phase Neolithic images usually have a patina that formed after the art and is evenly dispersed over both the images and the background.Later petroglyph artists took advantage of desert varnish, a dark, often shiny glaze that forms on rock surfaces in very arid environments.Around 10,0000 BCE, a significant climate change occurred, altering environments, flora, and fauna in most parts of the world.Following the Pleistocene, the Holocene or Recent epoch, witnessed a marked global warming that we still experience today.
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The patina is darker on the older images and the newer images are brighter.