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The Richat Structure, or Guelb er Richât (Arabic: قلب الريشات, romanized: Qalb ar-Rīšāt, Hassaniyya: [galb er.riːʃaːt] ⓘ), is a prominent circular geological feature in the Adrar Plateau of the Sahara. It is located near Ouadane in the Adrar Region of Mauritania.
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The concentric Guelb er Richat is a prominent feature of the north-central region. Kediet ej Jill , near the city of Zouîrât , has an elevation of 915 metres (3,000 ft) and is the highest peak. The plateaus gradually descend toward the northeast to the barren El Djouf , or "Empty Quarter," a vast region of large sand dunes that merges into ...
Guelb er Richat structure. With a diameter of almost 50 kilometers (31 mi), it has become a landmark for Space Shuttle crews. Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be merely a symmetrical uplift (circular anticline) that has been laid bare by erosion.
The Richat Structure in Mauritania is not an impact crater, but rather a eroded anticline. It is 50km across, and shown in here in a topographic reconstruction (scaled 6:1 on the vertical axis) from sattelite photos. False coloring as follows: bedrock=brown, sand=yellow/white, vegetation=green, salty sediments=blue
The Guelb Aouelloul crater is 3.1 million-old impact crater which was studied by the noted Saharan scholar Théodore Monod. To the east beyond Ouadane is the distinctive Richat Structure, an uplifted and then heavily eroded dome of strata approximately 40 km across and whose concentric rings resemble an impact crater when observed from space.
Guelb er Richât: 28 November 2020 50 ouguiya Violet Ibn Abbas mosque, Nouakchott Teapot; musical instruments 28 November 2017 100 ouguiya Green Tower Cattle 28 November 2017 200 ouguiya Yellow Tower Camels 28 November 2017 500 ouguiya Blue Tower Trawler; fish 28 November 2017 1,000 ouguiya Brown Tower Locomotive of an ore train 28 November 2017
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