“We asked the local people about the rock art and they said that it would be very old, before their grandfathers,” Karberg told LiveScience. A number of the images appear to date back around 1,500 years ago, to a period when Christianity was spreading in Sudan. They include depictions of crosses, a church, which may show a nearby, ancient monastery called al-Ghazali, and one remarkable picture of a knight riding an animal with horns.---
Another, even more mysterious, set of rock art appears to be at least 5,000 years old and shows a mix of geometric designs. The "oldest rock art we found are the spiral motifs," said Karberg, which, as their name suggests, twist up in a way that is hard to interpret. Similar drawings have been found in the Sahara Desert. link
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