Richat Structure In Mauritania

The cause of the richat structure in the sahara desert of mauritania has been debated for many years. At first it was thought to be a meteor impact crater due to its circularity but this has since been disproven due to the lack of shock-altered rock in its vicinity.
This massive (30 mile diameter) oddity is now believed to have been a rock dome sculpted over time by erosion. This incredible image was taken by the advanced spaceborne thermal emission and reflection radiometer (aster) on october 7th, 2000.
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