There a small crater lies along the rim edge.

The rim edge is sharply defined and has received little wear from minor impacts.

It has undergone some wear along the rim edge from subsequent impacts.

There are small craterlets along the rim edge to the southwest and southeast.

No significant craters lie across the rim edge or the interior.

The rim edge is marked only by a few tiny craterlets.

He led the way up a series of steps cut into a big rock at the rim edge.

The rim edge is well-defined and has not been eroded by impacts.

The rim edge is not significantly eroded and remains well-defined.

As a result the structure has been worn down and the rim edge is no longer well-defined.