Figure 8
(A) Map shows the Greenheugh patch outcrop of the Greenheugh sandstone (GHS). Thin black lines are topographic contour lines at 50 m intervals. Black numbers are elevations in meters. This map was generated from the High Resolution Imaging Science Experiment (HiRISE) base map for Mars Science Laboratory (https://bit.ly/MSL_Basemap). Credit: Calef and Parker17. (B) An enlarged area of Fig. 8A shows symmetrical antidune ridges, also known as the Washboard18, that cover the entire surface of the Greenheugh patch. These ridges are about 100 m long, 0.5 m to 1 m high, have a spacing of 15 m, and are oriented at about N70ºW. Cyan line, cyan circles, and cyan numbers are the rover traverse, Sol locations, and the Sol numbers, respectively. White dashed line marks the crest of one antidune ridge.
