6 Geological Wonders of the World

Eye of the Sahara (Mauritania)

Also known as the Richat Structure, the eye-catching circular structure is best seen from space. It is 45 km across and located in Mauritania in the Sahara Desert in Africa. It is made of dominantly sedimentary (with minor igneous) rocks. Geological it is a formation known as a dome (domed anticline). Time has eroded the original topography, exposing the stratigraphic rock layers. “Anticline” mean that the rocks in the centre are the oldest (~ 1 billion years old) and the outer rings are younger (~ 480 million year old). Thus you can travel through time in the geological layers from the centre outwards.