Structure Rishat - a secret airfield UFO?

In Mauritania (Sahara desert) is an unusual structure Guell-Air Rishat (Richate), having the form of concentric circles.
Diameter of about 50 km geometric formation imeyuchi correct form. Geological studies have shown that this unusual structure of education, not a crater:

Figure 2

In more general terms, we see that the structure Rishat (Richate) is in a zone of darker color (Fig. 2).
At first glance it looks like a crater in the past, mining, than ever before, and he believed
but the structure Rishat (desert Moor Adrar, central Mauritania) formed by erosion and hardening of the volcanic dome.

For a long time, Rishat (Richate), served as a guide astronauts in orbit, the structure was a pretty good visible object in the huge space is no allocated Adrar Desert Moor. Satellite shows a sparse vegetation of the desert, about 50 km in diameter, formed to the south and east of the center of this natural phenomenon.
Almost perfectly round shape structures Rishat (Richate) still leads scientists to argue that it is in fact - from a meteorite crater, the remains of an extinct volcano or a secret airfield ... UFO?

Scientists in their research concluded that the formation of the structure could not Rishat obrazovatsya by volcanic eruptions due to lack of domes of volcanic rock ... Most researchers in the field of geological rock inclined to believe that the mysterious structures Rishat sedimentary rocks may be the result of lifting or erosion of the crust.
However, for all versions of Guell-Air Rishat (Richate), are still only a hypothesis ... Just like an unusually round shape of the structure of a mysterious ...

Sources of publication:
2012 - god.com
http://www.astronet.ru/
http://lifeglobe.net/entry/1070
http://wikimapia.org/1203554/ru

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