In the second ring there are at least 7 structures where the tops are now being exposed. These are substantial in size ranging from 70 to 300 ft.
[ex]. The most important Acheulean sites and their associated outcrops are found along the north-west of the outer ring, from which Wadi Akerdil heads east and Wadi Bamouere to the west. Sparse and widely scattered Neolithic spear points and other artifacts have also been found. However, since these sites were first discovered by Theodore Monod in 1974,[14] mapping of artifacts within the area of the Richat Structure have found them to be generally absent in its innermost depressions.[/ex]
The above also mentions a great deal of flood debris, mud in the area. Note that in 1974 there were no Satellite programs available to see these buried structures.
There are no known cultures or societies to have existed within this area as the history books fall silent in this area. Especially, when Northern Africa had a wetter climate, only 5000 years ago.
21° 7'4.04"N 11°16'26.18"W
21° 7'12.62"N 11°16'34.51"W
21° 7'15.42"N 11°16'48.78"W
21° 7'22.90"N 11°16'41.08"W
21° 7'52.48"N 11°16'24.53"W
21° 9'7.56"N 11°16'48.19"W
21° 1'8.49"N 11°26'49.60"W
One structure at the southern entrance was partially excavated which can be observed. No information is available as to what might have been found, or discovered.
There is a great debate ongoing as to the Richat being the Ringed City of Atlantis. Until these sites are excavated it can only be considered Circumstantial evidence. But in saying that there are other "Water" related irregularities in the Desert that are also circumstantial evidence to support that theory. And, there appears to be a very old road network present in Mauritania. It is well defined and segmented and extremely weathered, washed out in places. This road is present, deep in the desert appearing to come from, and go to, nowhere. It is not the work of bulldozers as the width is irregular and the edges appear to be made by piling rocks along its length, hand made.
For myself, I believe the "Ringed City" of Atlantis, has been discovered.