What geological feature is characteristic of the Mare Imbrium compared to the Caloris Basin?

Mare Imbrium is characterized by being more deeply flooded with lava compared to the Caloris Basin. This feature is significant because Mare Imbrium, a large basaltic plain on the Moon, is one of the best examples of lunar maria formed by ancient volcanic activity. The lava flows that filled the basin resulted in a smoother surface with fewer craters than surrounding highland areas. The continuous later flooding of lava allowed for a more extensive and flatter area, whereas the Caloris Basin, while large and also a result of volcanic processes, does not exhibit the same depth of lava flooding as Mare Imbrium.

This geological characteristic is influenced by the history of volcanic activity and the impact events that the regions have undergone. Mare Imbrium's thicker deposits of lava contribute to its appearance and geological structure, distinguishing it from the relatively less flooded Caloris Basin, which shows more of the underlying impact scars rather than the smooth, lava-filled surface typical of Mare Imbrium.