Theophilus - 104 km wide, 7 km deep
(click on image for a larger view, then click "BACK")
Theophilus is the uppermost of three craters. These three show a great example of the affects of age. The top crater is the youngest and looks fresh with a high central mountain and steep walls. Cyrillis, next down the line is showing a lot of age with collapsed walls and a couple of worn down mountains. Catharina, on the bottom, is pretty will ruined. It has collapsed walls and no mountain at all. The Altai scarp is a 500 km long 1 km high cliff. It is the edge of the impact basin that formed Mare Nectaris.
Image: March 06, 2006