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. 2017 Dec 7;122(12):2544–2573. doi: 10.1002/2017JE005324

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©2017. The Authors.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Mastcam mosaic and images of the central portion of the Namib Dune lee slope. (A) Mastcam mosaic and (B) digitized sedimentary processes. (a) grainflow lobe; (b) grainflow scarp; (c) impact ripples; (d) fractures; (e) grainfall; (f) large ripples; and (e and f) dune basal apron. (C) Mastcam image of the impact ripples on the lee slope. The asymmetry of the impact ripples is not clear and wind flow direction cannot be determined from these structures alone. (D) Brinkline of Namib Dune showing the “double‐step” morphology from the migration of large ripples over the brink. Images: mcam05491, Sol 1198 (Figure 12A); mcam05508, Sol 1201 (Figure 12C); and mcam05449, Sol 1196 Figure 12D.