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Structure

Guelb er Richat kwadrat

 

Richat Structure  Mauritania

Richat Structure, Mauritania.

This prominent circular feature in the Sahara desert of Mauritania has attracted attention since the earliest space missions because it forms a conspicuous bull's-eye in the otherwise rather featureless expanse of the desert. Described by some as looking like an outsized fossil in the desert, the structure, which has a diameter of almost 30 miles, has become a landmark for 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 that has been laid bare by erosion. Paleozoic quartzites form the resistant beds outlining the structure.

Image Credit: NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team

Last Updated: Aug. 7, 2017

 

Richard Structure

 

Richat Structure02

 

Richat Structure03

 

Richat Structure04

 

Guelb er Richât

  • Depression
  • Location:  , ,
  • Latitude:  21° 7' 1.8" (21.1172°) north
  • Longitude:  11° 24' 6.6" (11.4018°) west
  • Elevation:  423 metres (1,388 feet)

 

Other Names for Guelb er Richât

  • Er Rîchât
  • Guelb er Richat
  • Richat
  • Richate
     
     
     

 

Richat_structure_Mauritania

 

 

  • Title Richat structure, Mauritania
  • Released 02/05/2014 10:00 am
  • Image credit JAXA/ESA
  • Description

    A giant, geological wonder in the Sahara Desert of Mauritania is pictured in this satellite image.

    The 40 km-diameter circular Richat structure is one of the geological features that is 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 molten rock uplifting and, once at the surface, being shaped by wind and water into what we see today. Concentric bands of resistant quartzite rocks form ridges, with valleys of less-resistant rock between them.

    The dark area on the left is part of the Adrar plateau of sedimentary rock standing some 200 m above the surrounding desert sands. A large area covered by sand dunes – called an erg – can be seen in the lower-right part of the image, and sand is encroaching into the structure’s southern side.

    Zooming in on the southern side of the bullseye, we can see individual trees and bushes as tiny dots. These follow a river-like structure that appears to have been dry when this image was acquired, a few weeks after the rainy season. Some areas to the south and east of the Richat appear to be covered with temporary lakes, which are dry for most of the year.

 

 


 

Geody distances from Guelb er Richat

Name Country Feature Latitude Longitude Dist. (km) Dist. (mi) Bearing Direction
Agouâdîr Mauritania Ruins 20.99647 -11.43956 13.99 8.7 196° SSW
Aïn Saada Mauritania Well 20.96811 -11.31606 18.83 11.7 208° SSW
Archâne Mauritania Well 21.18586 -11.48426 11.48 7.13 48° NE
Batha Chig Mauritania Zone 21.03224 -11.30618 13.71 8.52 226° SW
Batha Hassi Maouloud Mauritania Hydrographic feature 21.01583 -11.39233 11.32 7.04 185° S
Batha Oued Lazguer Mauritania Terrain 21.17227 -11.5201 13.73 8.53 63° ENE
Batha Ti-n-Jouker Mauritania Terrain 21.10153 -11.49313 9.64 5.99 260° W
Bathet Hassi Maouloûd Mauritania Hydrographic feature 21.01583 -11.39233 11.32 7.04 185° S
Bouatène Mauritania Terrain 21.20772 -11.44389 10.99 6.83 23° NNE
Bou Tellis Mauritania Well 21.0306 -11.4499 10.85 6.74 207° SSW
Btéat Chrak Mauritania Hydrographic feature 21.15134 -11.48672 9.6 5.97 67° ENE
Bteat el Agol Mauritania Hydrographic feature 21.13325 -11.44443 4.77 2.97 68° ENE
Btêhât Chrak Mauritania Hydrographic feature 21.15134 -11.48672 9.6 5.97 67° ENE
Btéhât el Ogol Mauritania Hydrographic feature 21.13325 -11.44443 4.77 2.97 68° ENE
Case des Mohammed Fadel Mauritania Fort 21.0204 -11.35513 11.81 7.34 204° SSW
Dakhlet Mint Lebchir Mauritania Terrain 21.01843 -11.41278 11.05 6.87 186° S
Dakhlet Sbot Mauritania Hydrographic feature 21.06667 -11.3 11.98 7.44 242° WSW
Dakhlet Taleb Mauritania Hydrographic feature 21.04752 -11.31697 11.74 7.29 229° SW
Dar Ould Mohammed Fadel Mauritania Fort 21.0204 -11.35513 11.81 7.34 204° SSW
Dayet el Mesrane Mauritania Terrain 21.08628 -11.37921 4.16 2.59 214° SW
Djouif Dzouig Mauritania Terrain 21.04462 -11.39393 8.12 5.04 186° S
Djouif el Khouifi Mauritania Terrain 21.05833 -11.39908 6.56 4.07 183° S
El Kdîm Mauritania Hydrographic feature 21.00562 -11.37871 12.65 7.86 191° S
El Mbeïdih Mauritania Hydrographic feature 21.05814 -11.50797 12.83 7.97 239° WSW
Er Rîchât Mauritania Terrain 21.11716 -11.40183 0 0    
Gleïbat Naaj Mauritania Terrain 21.04731 -11.31322 12.05 7.49 230° SW
Gleïb el Akhdar Mauritania Rocky massees 21.0688 -11.34791 7.77 4.83 226° SW
Grara Cheguira Mauritania Terrain 21.12385 -11.26367 14.37 8.93 87° E
Guelb er Richât Mauritania Terrain 21.11716 -11.40183 0 0    
Guelibat Naj Mauritania Terrain 21.04731 -11.31322 12.05 7.49 230° SW

 


 

Middle English, the process of building, from Latin strūctūra, from strūctus, past participle of struere, to construct

 

The structure of modern science: a complex system considered from the point of view of the whole rather than of any single part.
 
 
 
 

 

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