A striking circular geological formation in the Sahara Desert, often described as an “eye,” has been captured in new imagery by NASA’s Earth Observatory. The structure, known as the Richat Structure, is a prominent landmark visible from space and is sparking renewed scientific interest.
Located in northwestern Mauritania, the Richat Structure spans approximately 45-50 kilometers (28-31 miles) in diameter. Its distinctive concentric rings, composed of both sedimentary and igneous rock, make it easily identifiable in satellite and aerial images. The formation’s unique appearance has captivated astronauts since the first photographs were taken during the Gemini 4 mission in 1965.
For years, scientists debated the structure’s origins, with some hypothesizing it was created by a meteorite impact. However, geological studies, including research conducted by the University of Quebec in Canada, have revealed a different explanation. The Richat Structure is now understood to be the result of a geological dome, also known as a circular anticline. This means it formed as subsurface igneous intrusions deformed the overlying sedimentary rock layers, exposing the rock in concentric rings, with the oldest layers at the center.
The structure is surrounded by extensive fields of longitudinal and transverse dunes, which develop perpendicular to the wind direction. Erosion continues to shape the Richat Structure, progressively exposing new rock layers and altering the surrounding landscape. These ongoing processes reveal the region’s geological history, layer by layer.
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The Richat Structure has also been identified as a site of significant archaeological importance, containing exceptional accumulations of Acheulean Paleolithic stone tools. Recognized for its scientific value, it was selected as one of 100 geological heritage sites by the International Union of Geological Sciences (IUGS). This designation underscores the structure’s importance for understanding Earth’s geological processes and history.
