A "cross-bed" is a geological feature formed by the deposition of sediment in inclined layers, typically seen in sedimentary rocks. This occurs when sediment is transported by wind or water and then deposited at an angle, creating a series of sloping layers. Cross-beds are often found in environments like riverbanks, dunes, and deltas. These structures are important for understanding past environments and sedimentary processes. They can indicate the direction of sediment transport and help geologists interpret the history of a particular area. Cross-beds are commonly studied in fields such as geology and paleontology.