Cross-bedding is a geological feature found in sedimentary rocks, characterized by layers of sediment that are inclined at an angle to the main bedding plane. This occurs when sediment is deposited by wind or water, creating slanted layers as the material shifts and settles. The presence of cross-bedding can provide important information about the environment in which the sediment was deposited. For example, it often indicates past river or dune formations, helping geologists understand the history of the Earth's surface and the processes that shaped it over time.