BRACELETS IN THE SAHARA

In the center of the Sahara I found some structures that look like bracelets. Since I assume that these are also old graves, I called them "bracelet graves". Although they have a central rotunda with two arms extending from them, they don't seem to fit in with the large family of antennae graves. I haven't seen these strange shapes anywhere else on the internet either. What are they? How old or young are they? does anyone know more?

(Geographical coordinates below the pictures)
24.64271,5.38688
24.64271,5.38688
25.63685,5.75289
25.63685,5.75289
24.39377,5.76095
24.39377,5.76095
25.69671,5.93342
25.69671,5.93342
24.12049,6.87303
24.12049,6.87303
22.93104,5.32823
22.93104,5.32823
24.12282,6.89031
24.12282,6.89031
23.53755,5.86445
23.53755,5.86445
24.45148,5.41397
24.45148,5.41397
24.37898,5.49838
24.37898,5.49838
24.20936,4.86845
24.20936,4.86845
22.88515,5.85524
22.88515,5.85524
Images courtesy of Google Earth™

Even the renowned specialist for prehistoric Sahara monuments Yves Gauthier could not tell me anything about these structures. He himself has a few dozen of them in his database, but he doesn't know more than that they exist, he told me when I asked. So far, he is not aware of any scientific publication about it or whether a name is already in use for it somewhere.

These pictures are only a small selection. All the objects I found are included in the following download (Google Earth required): Download placemarks of 43 bracelet monuments >



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