The linear features in this VIS image are located on part of the large flow feature on the southern flank of Ascraeus Mons. The features most likely formed by collapse of the surface into voids created by tube fed lava flows. Orbit Number: 74376 Latitude: 8.57379 Longitude: 253.317 Instrument: VIS Captured: 2018-09-20 09:08 https://photojournal.jpl.nasa.gov/catalog/PIA22843