Geological Chronicle
Werner sits in the rugged south-central highlands of the Moon, spanning 70.59 kilometers across. The impact structure dates to the Eratosthenian period, which spanned from 3.2 to 1.1 billion years ago. In contrast to neighboring formations like Blanchinus to the north and the distorted Regiomontanus to the west, Werner retains a remarkably fresh rim with little evidence of wear.
The crater drops steeply from its crest, creating a depth of 4.2 kilometers between the rim and the lowest floor. Its interior walls feature terraced slopes with peaks rising nearly 1,500 feet, while the exterior displays a distinct rampart. Low rises and a prominent central peak mark the floor, and to the southeast, a rugged valley separates Werner from the adjacent crater Aliacensis.