This VIS image shows a section of Sirenum Fossae. The linear features are called graben. Graben are formed by blocks of material sliding downward between pairs of faults. Orbit Number: 74365 Latitude: -28.1401 Longitude: 215.795 Instrument: VIS Captured: 2018-09-19 11:11 https://photojournal.jpl.nasa.gov/catalog/PIA22802