Field analysis of five slump blocks in consolidated Upper Cretaceous strata along the southern margin of the Saline River Valley shows that their movement is a result of physical erosion, gravity, joint attitudes, block size, and dictility contrasts. Vertical offsets range from 3.5 inches (9 cm) to 180 feet (54 m). Slump movement is very slow and is accomplished by rigid body translation along near vertical joints in the competent Fort Hays Limestone and by rotational creep about a concave-upward plane in the less competent Codell Sandstone and the incompetent Blue Hill Shale. The attitude of the axes of rotation are horizontal and trend parallel to the strike of the joint sets along the valley escarpments. The magnitude of the rotations range from zero to seventy degrees. The age of initial slumping is post-Miocene to prePleistocene. This study focuses on the structure and origin of five slump blocks located along the southern margin of the Saline River Valley in north-central Ellis County, Kansas, specifically SE 1/4, SE 1/4, Sec. 18, T 11S, P17W (Fig. 1). No published data exist on these specific slump blocks and no kinematic studies exist on any faults in Ellis County, Kansas. Kinematic analysis is the reconstruction of movements that take place during the formation and deformation of rocks. Bass (1926) mapped many normal faults in the northwestern part of Ellis County. Twenhofel (1925) stated that surface faulting in western Kansas is a result of surface adjustment to salt solution, conversion of anhydrite to gypsum in the subsurface, settling of Cretaceous sediments over the Permian unconformity, differential compaction of sandstone and shale in the post-Permian sediments, or surficial slumping.