This crater formation has been significantly disintegrated by smaller impacts around the outer rim, leaving a wall that is deeply notched and incised.

There is a gap in the western rim through which the interior has been flooded and resurfaced by layers of basaltic lava.

Thus all that remains of the original crater is an irregular, crescent-shaped formation along the southern edge of the Lacus Somniorum.

This feature begins to the north of Hall and travels to the south-southwest, gradually bending back to the south-southeast.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Hall.