Crater on Crater

This VIS images shows part of two unnamed craters in Noachis Terra. The younger of the two craters is at the bottom of the image with one side visible in the image. The older and much larger crater has just part of the rim and floor visible towards the top of the image. The overlapping of one crater on top of another allows for relative dating to be done. We don't know the exact ages of each crater, but we can define which came first.