A geoglyph is a large design or motif produced on the ground and typically formed by clastic rocks or similarly durable elements of the landscape, such as stones, stone fragments, live trees, gravel, or earth.
Archaeologists have come to the conclusion that at least two of the giant 'wheels' from Wadi Al Qattafi and the Wisad Pools, in the Black Desert of Jordan are at least 8,500 years old - making them older then the famous Nazca Lines in Peru by about 6,000 years.
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