Although Mimas is heavily cratered, the cratering is not uniform. Impact cratering is the most notable geological process on the Moon. Ryugu shows variations of crater density that cannot be explained by randomness of cratering. The Hesperian was thus a time period of rapidly declining impact cratering rates. They were not true seismic weapons, but effective cratering weapons. The Bedout impact hypothesis has not been widely supported by impact cratering specialists. Impact cratering is a common occurrence on many Solar System bodies. Like Ida, Dactyl's surface exhibits saturation cratering. This phenomenon is called "cratering" in oil field slang. Today these mildly sloping plains are marked by ridges, low hills, and sparse cratering. The extensive cratering indicates that Epimetheus must be quite old.