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Originally Posted by wikipedia
The Richat Structure is a deeply eroded, slightly elliptical dome with a diameter of 40 kilometres (25 mi). The sedimentary rock exposed in this dome ranges in age from Late Proterozoic within the center of the dome to Ordovician sandstone around its edges. |
Just a bulge shaved flat by erosion, exposing the strata as concentric rings.
Or maybe an Atlantan beacon to be observed from space, like the crew of the ISS does now. the Acheulean people who lived there may not have erected the structure but they did make nice stone hand axes.
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