Sedimentary rocks are usually **stratified**. Sedimentary rocks are formed by the accumulation of sedimentary materials such as minerals, organic matter, and rock fragments, which are then compacted and cemented together. These rocks are typically formed in layers or strata, with each layer representing a different period of deposition. The layers can often be seen as visible bands of different colors or textures, and they can provide important clues about the geological history of the area where they are found.