Auqakuh Vallis: "Old Riverbed" or "Windblown Ripples"? (Original NASA/MGS/MSSS b/w Frame)

Caption NASA originale:"This MGS-MOC image shows windblown ripples on the floor of Auqakuh Vallis.
The light-toned area, running diagonally across the scene from South-West to North-East, may be dust that has accumulated in the bottom of the valley and on top of the ripples".

Location near: 31,3° North; 299,3° West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Spring