Mysterious Martian 'Ridges'

The scene in the images covers an area of approximately 140 by 80 km at the mouth of Tiu Valles...

...Its winding, meandering ridges, bound by depressions, are eye-catching. The exact processes that formed these odd structures are unknown. One possibility is that during floods, water or water-rich surface layers came in contact with lava from the surrounding areas, which then might have led to the formation of these mysterious ridges.