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The patina is darker on the older images and the newer images are brighter.
Although it is difficult to state the absolute ages of most of the rock art studied in this project, there are certainly general trends, best estimates and bracketing dates, which will be provided whenever possible.
The earth at that time was considerably colder and the ice caps were much larger than they currently are.
Many species, such as mammoth and woolly rhinoceros thrived in Eurasia and the mammoth, mastodon, camel and giant sloth lived in North America.
Around 10,0000 BCE, a significant climate change occurred, altering environments, flora, and fauna in most parts of the world.
The most common Neolithic scenes are of hunter-herders with bows and arrows and throwing sticks, which are similar to a boomerang.
The climate was not stable, however, and around 7000 BCE, monsoon patterns shifted northward, causing the Arabian Peninsula to be more like a savanna than a desert.
Rivers flowed, lakes formed, and the human inhabitants, flora and fauna embraced this lusher environment.
On rare occasion, archaeological deposits can accumulate up against a petroglyph panel, concealing part or all of the art.
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.