<P> In aeolian or fluid depositional environments, where there is a decrease in transport energy over time, the bedding material is sorted more uniformly, according to the normal grading scale . As water or air slows, the turbidity decreases . The suspended load of the detritus then precipitate . In times of fast movement the bedding may be poorly sorted on the deposition surface and thus is not normally graded because of the quick movement of the material.In broad channels with decreasing slopes, slow - moving water can carry large amounts of detritus over a large area . Thus, graded beds form at points with decreased slopes in wide areas with less bounding of energy current flows . The energy is dispersed and decreases . Turbid sediments precipitate in concordant sizes and shapes in layers . </P> <P> Changes in currents or physical deformation in the environment can be determined upon observation and monitoring of a depositional surface or lithologic sequence with unconformities above or below a graded bed . Detrital sedimentary graded beds are formed from erosional, depositional, and weathering forces . Graded beds formed from detrital materials are generally composed of sand, and clay . After lithification, shale, siltstone, and sandstone are formed from the detrital deposits . </P> <P> Clastic formations are of organic sources, such as biochemical chert, which forms from siliceous marine organism decay and diagenesis . Organic sedimentation of parent material from decaying plant matter in bogs or swamps can also result in a graded bedding complex . This activity leads to formation of peat or coal, after thousands of years . Limestone is more than 95% biogenic in origin . It is made from the deposition of carbonate fossils of marine organisms . Bio erosion caused by animals, such as bivalves, shrimp and sponges change the marine substrate, resulting in layered bedding planes, due to their sifting of bed material in search of food . Organic clastic bedding can become shale and oil shale or millions of years under pressure . </P> <P> A favored explanation is kinetic sieving . </P>

Where would you expect to find graded bedding