Each bed represents a homogeneous set of conditions of sedimentation. New beds indicate new conditions. Most layering is parallel, but occasionally it is inclined. These inclined layers are cross beds . Examples of sedimentary environments in which cross beds form are dune fields and deltas.
Graded beds occur when a mass of sediment is deposited rapidly.
The bedding has the coarsest sediment at the bottom and finest at the top. Often found forming in submarine canyons. A collection of graded beds is termed a turbidite deposit. Well exposed in many of the sea cliffs along So. Ripple Marks - Waves of sand often seen on a beach at low tide and in stream beds.