San Joaquin soils formed in old alluvium on hummocky topography. They are characterized by a large summit depression and hummocky flanks. Dott and Bourgeois launched an idealized hummocky stratification sequence. Stagnation of the ice led to the formation of hummocky moraine and glacifluvial deposits. Marystown lies on hummocky pyroclastic volcanic rock of mixed composition. The northern flanks also feature debris avalanche deposits with hummocky surfaces. The soils are typically moist, fine-grained, and often hummocky. The interior of Rembrandt includes two terrain types&colon; hummocky terrain and smooth plains. An extremely irregular surface may be called "hummocky". Hummocky material forms a broad annulus about from the Caloris mountains. Today this hummocky feature is covered with trees and other vegetation. However, hummocky ridges may form near the toe of the slump. Hummocky cross-stratification is a type of sedimentary structure found in sandstones. Many central-peak craters have rims that are scalloped, terraced inner walls, and hummocky floors. The terrain of the Missouri Coteau features low hummocky, undulating, rolling hills, potholes, and grasslands.