Richat Structure Enhanced Metal Print

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Richat Structure, Mauritania, Africa. Enhanced.

Lost in the Mauritanian Sahara desert, The Richat Structure has intrigued astronautssince NASA sent humans into orbit. This circular geologic feature is thought to be caused by an uplifted dome. Geologists would classify it as a domed anticline, eroded to expose the originally flat rock layers.

In this kind of geologic structure, rocks in the center are older than rocks forming the outer rings. This structure measures 28 miles across and is made up of igneous and sedimentary rocks. There are several faults visible (upper left) where strata that were once continuous have been shifted apart.

The 28 mile-diameter circular Richat structure is one of the geological features easier to observe from space than from down on the ground, and has been a familiar landmark to astronauts since the earliest missions.

Once thought to be the result of a meteor impact, researchers now believe it was caused by a large dome of mol...

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