There are three main types of sedimentary environments: continental, marine, and transitional. Continental environments include fluvial, lacustrine, paludal, glacial, and desert settings. Within fluvial environments, meandering rivers form sinuous channels and broad floodplains, depositing point bars and abandoned oxbow lakes. Deltas form at river mouths where sediment is deposited as delta plains, delta fronts, and fine-grained prodeltas.