On the left, the map is showing the location of impact crater paleokes and the number of sedimentary terraces that are observed in these craters. When they formed, impact craters generate structural terraces that are the result of the readjustment of the ground after the impact. Lacustrine sedimentary terraces are different. They are, thus, a good indicator of lacustrine episodes and changes in lake level. They can be recognized from the structural terraces as their stratigraphic level usually correspond to sedimentary terrace levels observed in the channel that is inflowing the basin, while structural terraces do not have specific correlation with the channel.
White arrows show the direction of the ancient flow.