Dune fields on Mars: Recorders of a climate change?

► A study of Martian dune fields has been done to measure the wind orientation responsible for dune geometry. ► Wind directions deduced from dune geometry are partially in agreement with current wind-patterns. ► Martian dune fields are constituted, in some cases, by active and fossil dunes. ► Martian dune fields are able to preserve information on paleoclimates over extensive periods.