Sag ponds which are developed from the northward rotation of the leading edges of the slump materials within the main slump block
are filled with water from seepages and heavy rainfalls (Fig.10).
Wreaths of mounded wall material step down from the rim scarp to the floor--not quite in terraces, yet more coherent than the simple slump blocks
prevalent in smaller craters.
Electric logs and cross-sections from drill holes show great slump blocks of Chesterian strata arranged en echelon along the sides of the valley bottoms (Figure 6).
Post-Paleozoic erosion of the land surface in this area has exposed the lower part of the Warrensburg valley fill sandstone underlain and flanked by the tilted slump blocks. The slump blocks tilted backwards as they moved downward into the valley giving the appearance of an anticline caused by structural deformation.
Also shown are the rotated slump blocks which have caused the tilting of the bedding away from the channel axis resulting in the valley anticlinal structure.
The valley anticlinal structure and the amount of repetition can best be explained by the breaking up of the valley walls into numerous slump blocks which moved toward the axis of the valley, the resulting tilt of the bedding being caused by rotation of the blocks.
The walls of these instantaneously created cavities collapse inward, creating slump blocks
Gambart has no wreath of slump blocks
or central peaks and thus is not a member of the impact-crater morphological main sequence.
I don't know why this crater's rim is so featureless when most craters of similar size and age carry hints of terrace slump blocks
Triesnecker itself is the archetype of a complex impact crater featuring a wreath of slump blocks
inside its bright and steep rim.