Richat Structure

The Richat Structure, also known as the Eye of the Sahara and Guelb er Richat, is a prominent circular feature in the Sahara near Ouadane, west–central Mauritania.

The Richat Structure is a deeply eroded, slightly elliptical dome with a diameter of 40 km. The sedimentary rock exposed in this dome ranges in age from Late Proterozoicwithin the center of the dome to Ordoviciansandstone around its edges.

The sedimentary rocks comprising this structure dip outward at 10°–20°. Differential erosion of resistant layers of quartzite has created high-relief circular cuestas. Its center consists of asiliceous breccia covering an area that is at least 30 km in diameter

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