This image captured by NASA 2001 Mars Odyssey spacecraft shows a large sand sheet with surface dune forms on the floor of an unnamed crater in Noachis Terra. Orbit Number: 58336 Latitude: -48.6161 Longitude: 34.0534 Instrument: VIS Captured: 2015-02-07 02:22 http://photojournal.jpl.nasa.gov/catalog/PIA19275