[:ja]「アフリカの目」「サハラの目」と呼ばれる、北西アフリカ、モーリタニアにあるリシャット構造体。標高100mほどのカンブリア紀の固い岩石山が同心円上に幾重にも重なっており、全体で直径50kmにも及びます。
長年の風化や浸食によって、柔らかい岩石部分が削られ、ドーム状の隆起運動のため環状になったと考えられますが、実は真相はよくわかっていないそうです。
ウェブ地球儀で地球俯瞰画像を見る： LiVEARTH
[Earthview Wonders] No.28: Richat Structure
The Richat Structure, known as the Eye of the Sahara or of the Africa, is located in west-central Mauritania. 50km diameter circular feature consists of a series of 100 meter high mountains made of Cambrian rocks.
It is hypothetically thought that erosion carved away soft sediments and dome-shaped bulge movement created circular feature, but the probable mechanism is still under discussion.
See earthview photo gallery with web-globe: LiVEARTH[:en]The Richat Structure, known as the Eye of the Sahara or of the Africa, is located in west-central Mauritania. 50km diameter circular feature consists of a series of 100 meter high mountains made of Cambrian rocks.
It is hypothetically thought that erosion carved away soft sediments and dome-shaped bulge movement created circular feature, but the probable mechanism is still under discussion.
See earthview photo gallery with web-globe: LiVEARTH[:]