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Last updated on June 18, 2013 at 20:05 EDT
Richat Structure in Mauritania
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Richat Structure in Mauritania

March 16, 2003
The so-called Richat Structure is a geological formation in the Maur Adrar Desert in the African country of Mauritania. 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. Landsat ETM image.