Craters caused by impacts on Mercury. These can be cut through by scarps (possibly compressed in the process) or covered over by volcanic ejecta. Some have long bright rays, while others have long dark rays. The transitional diameter of craters (10-12 km) between simple (bowl-shaped) and complex craters (central peaks and ridges) is twice that of Mars, despite the fact that surface gravity at both planets are roughly the same. The fact that the average impact speed is 2-3 times greater than that of Mars may be a contributing factor.
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