An archaeological team in the Bayuda Desert in northern Sudan has discovered dozens of new rock art drawings, some of which were etched more than 5,000 years ago and reveal scenes that scientists can’t explain.

The team discovered 15 new rock art sites in an arid valley known as Wadi Abu Dom, some 18 miles from the Nile River. It’s an arid valley that flows with water only during rainy periods. Many of the drawings were carved into the rock faces — no paint was used — of small stream beds known as “khors” that flow into the valley.

Some of the sites revealed just a single drawing while others have up to 30, said lead researcher Tim Karberg of the Westfälische Wilhelms-Universität Münster in Germany.

“We asked the local people about the rock art and they said that it would be very old, before their grandfathers,” Karberg told LiveScience.

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