THEMIS Image of the Day, November 6, 2018. Numerous gullies dissect the northern rim of this unnamed crater in Terra Sirenum.
The inside of the north rim faces away from the Sun and is more deeply gullied than the Sun-facing rim on the south side. Some scientists have proposed that such gullies were eroded by snowmelt.
Note also the faint radial streaks on the ground outside the southern rim. These are likely remnants of the impact blast that made the crater. (Streaks are also visible to the north of the crater, but are even fainter.)