Not Round... (Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)

Caption NASA:"There are several reasons that an impact crater may end up not being round. Preexisting faults and fractures in the ground can control how the impact energy is distributed, resulting in corners or straight walls along the fracture trends. Very low angle impacts (from 5 up to 12°) can 'skip' along the surface, creating an elongated crater".