This is a picture of the Rover atop the Mermaid Dune.
Click on image for full size
The Mermaid Dune
During the Mars Pathfinder Rover's exploration of the Martian surface, it went over what scientists now call the "Mermaid Dune". The soil on top of Mermaid Dune seemed to be dark gray. However, when the Rover crossed the dune, it disturbed the soil and there was a dark red soil underneath. A picture of the disturbed soil is shown here.
There are many portions of Mars covered by sand dunes, including gaint sand dunes at the south polar region.
Study of these dunes and soils helps scientists understand the erosion of the Martian surface.
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