Today's VIS image shows a field of sand dunes in an unnamed crater located in Margaritifer Terra. Most sand dunes on Mars are made of dark basaltic sands. Orbit Number: 78228 Latitude: 6.60598 Longitude: 346.706 Instrument: VIS Captured: 2019-08-03 14:35 https://photojournal.jpl.nasa.gov/catalog/PIA23455