The sand dunes are dark, but they are there and high like a wall, add light to see them for yourself.
UPDATE Dec 19: I have found some odd structures (above photos) along the edge of the dunes. These are buildings that are 6-9 inches tall. You heard me right. I did make this up. Take a look at it for yourself, but you will have to make the original 8X bigger to view it. SCW http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/01196/opgs/edr/ncam/NRB_503674478EDR_D0512710TRAV00404M_.JPG
Date of discovery: Dec 19, 2015
Location of discovery: Mars
Photo 1: http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/01196/opgs/edr/ncam/NRB_503679013EDR_F0520000NCAM07753M_.JPG
Source photo 2: http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/01196/opgs/edr/ncam/NRB_503678520EDR_F0520000NCAM00273M_.JPG
Source photo 3: http://mars.jpl.nasa.gov/msl-raw-images/proj/msl/redops/ods/surface/sol/01196/opgs/edr/ncam/NRB_503678551EDR_F0520000NCAM00273M_.JPG
You may have heard this week about NASA using the rover to investigate some sand dunes that are always changing shape. They change shape so often that even NASA doesn't know how they do it. Well we have seen no photos of these dunes until now. I found them today. I am posting these photo of the ever changing dunes and there are no aliens or UFOs, but just the photos that NASA didn't want you to see and even the press has not seen. It is possible, that the sand was made from digging out the tunnels below the surface, tunnels needed to survive on this planet. Like ants making tunnels, but needing to push the excess sand to the surface. The constant pushing up of sand would change its shape.
Scott C. Waring
I added some light, NASA made these photos much darker to hide them.