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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 Bedding Sedimentary rocks are normally deposited as horizonal layers. Even when folded or tilted by faulting the originally horizontal layering is obvious. Upon closer examination, however, you may see very fine layers (usually 1 to several mm thick) that are at an angle to the main bedding. These tilted layers contained within larger layers are termed cross bedding. If you go dig trenches into modern sediments, you will find that cross-beds form a part of ripples and dunes.