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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.
Cross beds form from running water. As the water flows, it creates bedforms, such as ripples or dunes, on the floor of the channel. Sediment deposited on the downcurrent side of these bedforms is deposited at an angle--not horizontally. If preserved, the layering is also inclined and dips in the direction of water transport. Cross beds can therefore form in any environment with moving water, such as braided or meandering rivers, shorelines of lakes or oceans, or in submarine settings which are affected by deep sea currents.