Fig.17. Cemented layer at the ridge of dunes on Mars (source:NASA/JPL/UA) (a) Cemented layer at the ridge of giant barchans in the north polar region of Mars (Arrows represent the wind direction of dune development); (b) The image of black box area in (a), white arrow indicates the cemented ridge (HiRISE ESP_018011_2565_RED, center point: 95.26°E, 76.22°N)
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