Sand granules are transported in three ways&colon; suspension, saltation, and creep. Total quantity includes dissolved, suspended, saltation and bed loads. There are two main ways to transport bed load&colon; traction and saltation. A saltating grain may hit other grains that jump up to continue the saltation. All of the soils are sandy, transported by saltation. Evidence exists for various forms of saltation in a variety of organisms. Like this archosaur, basal pterosaur lineages have plantigrade hindlimbs that show adaptations for saltation. Alternatively, sand may be moved by saltation (a bouncing movement of large particles). In that sense, it includes the termination of transport by saltation or true bedload transport. Saltation layers can also form in avalanches. The word "saltation" refers to the leaping or jumping nature of the percept. Wind-blown sand moves up the gentle upwind side of the dune by saltation or creep. Cicadas, unlike other Auchenorrhyncha, are not adapted for jumping (saltation). In recent years there are some prominent proponents of saltation, including Carl Woese. In the early 20th century a mechanism of saltation was proposed as large mutations.