The system of radial structures in the uplands surrounding Mare Imbrium contains a variety of objects and has modified certain pre-mare features. Many of the structures cannot be the result of gouging by flying fragments. They may have formed along radial fractures associated with an Imbrium impact. The morphological evidence for crustal breakup suggests that this impact occurred during a high-temperature stage in the outer layers of the moon when the surface was in tension and the subsurface plastic.
Communications of the Lunar and Planetary Laboratory
- Pub Date: