Fig. 7
From: Water on Mars: Do submarine cyclic steps exist on the red planet?
Aeolian cyclic steps on the North Pole of Mars (modified from Smith et al. 2013). Shaded relief surface from MOLA elevation data demonstrates that a spiral troughs cover majority of the polar cap (left) and display a recognizable spiraling pattern due to the direction of katabatic winds working together with the Coriolis force (right). SHARAD profile a-a’ shows b stratigraphy associated with spiral trough migration