The Richat Structure, a prominent circular feature in the Sahara desert of Mauritania near Ouadane, 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 ammonite in the desert, the structure, which has a diameter of almost 50 kilometres (30 miles), has become a landmark for space shuttle
crews. Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be a symmetrical uplift
(circular anticline or dome) that has been laid bare by erosion. Paleozoic quartzites form the resistant beds outline the structure.
Could it have some sort of extraterrestrial origin? Does anyone have more information about this enigmatic structure?
[edit on 14-10-2009 by genma]