The ridges in this VIS image are creating shadows due to low sun angle. Shadows can give indications of the shape of the feature that is casting the shadow. Orbit Number: 67866 Latitude: -79.1408 Longitude: 266.294 Instrument: VIS Captured: 2017-04-02 00:59 https://photojournal.jpl.nasa.gov/catalog/PIA21678