ABSTRACT
Deltas only form where rivers bring more sediment into the sea than can be re-worked by marine current. By their very nature, therefore, deltaic sequences indicate a regression of the shoreline. Where marine currents are strong enough to redistribute land-derived sediment, linear shorelines are formed with bars and beaches running parallel to the coast. Both deltas and linear shorelines deposit sediment in a wide range of sedimentary environments ranging from continental to marine. Studies of Recent sediments show that both linear and lobate shorelines can form upward-coarsening regressive sequences.
