Rocky outside the things, not rocky inside the things.
My first guess was farm plots. That long ago, might have been enough water/rain in the area to make it work.
But then I noticed the interior was elevated over the exterior in the pic I was looking at so the “not rocky inside” might be from wind drifted silt built up over the long while?
Equivocation is like driving down the middle of the road, pretty soon there’s going to be a badd accident
This is blatant political ads
Ah ... raised garden beds ?
If the soil inside is screened of rock better than the soil outside your AG idea seems correct.
Wonder how they align with the sun and moon as other AG considerations
“My first guess was farm plots. That long ago, might have been enough water/rain in the area to make it work.”
Not in the Nefud. The Sahara may have been hospitable around the neolithic era, but the Arabian desert has been inhospitable for much much longer.