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!!!Richat Structure

[{Image src='130mr.jpg' alt='Richat Structure' class='image_left' height='800' caption='Image courtesy of USGS. ' width='742'}]
[{SET customtitle='Richat Structure'}]
The so-called Richat Structure, center right in this false-color satellite image, is a geological formation in the Maur Adrar Desert. Compare this image to the true-color photo taken from a spacecraft. 

Although it resembles an impact crater, the Richat Structure formed when a volcanic dome hardened and gradually eroded, exposing the onion-like layers of rock.