Scarps confined to crater floors

Caption NASA originale:"The scarp in this 35-Km crater (See PIA02433 for the location in a larger view) forms a broad lobe 10 Km wide, whose southern end abuts against and follows closely the irregular contour of the crater wall. These structural relations suggest the scarp is a lava flow front rather than a fault.
This image (FDS 27471) was taken by Mariner 10 during its first encounter with Mercury".