In the eastern part of Mesquite Dune field, it seems like a simple story. Sands all bulk move in one direction.
But when you walk out there it is beautifully complex.
Look at these transverse ripples going up this barchanoid dune as you'd expect. Dune creeping image left (S) to right (N). Cool.
But then look at the ripples in front of slip face. They indicate hyper-local grain transport away and to right from camera. (To NW). Bizarre!
Dune influencing wind direction!