Crater Chain

Crater chain found on Ganymede. Image Source:

Several craters along a general line that may be overlapping, touching, or separate from one another. A crater chain, or catena, is typically the result of either secondary impacts or volcanic activity. Several unusual crater chains have been found on Ganymede and Callisto that appear to be the impact scars of tidally disrupted comets or asteroids. These features serve to record the characteristics of comets and support the rubble-pile model for comet nuclei and some asteroids, in which these objects are formed of many small, loosely bound fragments. A couple of crater chains have been found on Earth, including the Aorounga Craters.