the so-called richat structure is a geological formation in the maur adrar desert in mauritania, africa. it does sort of resemble an impact crater, but actually the richat structure formed when a volcanic dome hardened and gradually eroded, exposing the layers of rock. just in case someone is interested in earth art, here is a good place to start
http://edcw2ks15.cr.usgs.gov:8090/ImageGallery/SilverStream/Pages/pgcollectiondisplay.html
28 February, 2005
richat structure
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