Geological Chronicle
Wegener is a 95.78-kilometer-wide impact crater in the northern hemisphere of the Moon's far side, located roughly midway between the equator and the north pole. Its southwestern rim intrudes slightly into the much larger walled plain Landau, while the crater Stefan is attached to its eastern rim. The formation lies at the approximate margin of the Coulomb-Sarton Basin, a 530-kilometer-wide impact structure dating to the Pre-Nectarian age.
The crater is in an intermediate stage of impact erosion, with a worn rim that is generally more eroded in its northern half. A small crater lies across the western inner wall and part of the interior floor, accompanied immediately to the east by a cup-shaped craterlet. While a wider southern inner wall leaves irregularities across the southern section of the floor, the remainder of the interior forms a nearly level and featureless plain.
Prior to formal naming by the International Astronomical Union in 1970, the crater was designated Crater 99. The IAU formally named the feature after German geophysicist, polar researcher, and meteorologist Alfred Wegener, originator of the theory of plate tectonics.