Complex Floor Crater

Located in Noachis Terra, this unnamed crater has an unusual crater floor morphology. At some point after the crater formed, the interior was filled by materials that reached almost to the top of the crater rim. At some later point, a deep depression formed within the crater. Small gullies dissect the sides of this depression. The mechanism of both the filling of the crater and the formation of the depression is not known. The dark portions at the top of the depression are likely caused by dust removal, either by downslope movement or the presence of moisture. This image was collected in mid-spring.