If you would take this map of Africa ... and highlight the zones of striation .. please ...
Or screen capture your live map and over paint in light transparency the areas ... and leave it attached to, or supply a third map with the continent attached to the rest of the world, (and the axis is pre-shift . . Pre Dendera?)
This is likely geograpic//earth force work, not applied labor, like Nazca, or Tellinger's elephant serviced circles ... for mining gold or what ever ... though there might be another reason for those enigmatic rocks the circle maker's used!
East to west implies forcing by atmosphere -- if the orientation is post Pangea. . .
Remember much of the Sahara was lakes --(much rain, soft, susceptible soils, constantly re-wetted stone) for perhaps 2000 years. If these areas are low lying, there can be other forces, . . .
See if you can find any geophysical reports on the type of stone, . . . Mining assays, well permits, soil studies for better agriculture . . Etc . . ... look for the permit issuer or large business seekers first.
Everyone loves a mystery!
Mind is the rider.