OBSERVING NOTES AND COMMENTS

Damaged circular formation.
Steep slopes riddled supporting crater Blancanus to the
South-West.
Very high walls ridden by Porter to the North-East
Rutherford to the South-East Clavius K to the South-West
and Clavius L to the West.
Large flat floor with Clavius D C N J & JA on an arc of circle.
Numerous craterlets whose a chain to the South-West.
Lines of crests.