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Cross-bedding in a sandstone dome in the Canyons of the Escalante. Sand dune cross-beds can be large, such as in the Jurassic-age erg deposits of the Navajo Sandstone in Canyonlands National Park.
Hummocky cross-stratification from the Arisag Formation (Silurian), Nova Scotia. Hummocky cross-stratification is a type of sedimentary structure found in sandstones. It is a form of cross-bedding usually formed by the action of large storms, such as hurricanes.It takes the form of a series of smile-like shapes, crosscutting each other.istory [edit]. The name was introduced by Harms et al. in 1975. Before this time, these structures were recognized under many different names. When hummocky cross-stratification was founded, it was originally given the name âtruncated wave-ripple laminae,â by Campbell (1966, 1971).