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==Eolian lithofacies associations==

==Eolian lithofacies associations==

Eolian lithofacies associations include dune, interdune, fluvial, and sabkha environments ([[:file:M91FG170.JPG|Figure 1]]). Dunes form where large volumes of dry sand are blown across the landscape. Lying between the dunes are the interdune areas, which are flat-lying belts or depressions. These areas may be subjected to either erosion or deposition. In wetter conditions, alluvial fans may extend outwards from upland areas, and fluvial sediments can be deposited by ephemeral streams. Large damp to wet areas between the dunes may dry out to form flat-lying evaporitic crusts called [[sabkha]]s. Playa lakes are desert lakes that episodically dry out.

Eolian lithofacies associations include dune, interdune, fluvial, and sabkha environments ([[:file:M91FG170.JPG|Figure 1]]). Dunes form where large volumes of dry sand are blown across the landscape. Lying between the dunes are the interdune areas, which are flat-lying belts or depressions. These areas may be subjected to either erosion or deposition. In wetter conditions, [[alluvial]] fans may extend outwards from upland areas, and fluvial sediments can be deposited by ephemeral streams. Large damp to wet areas between the dunes may dry out to form flat-lying evaporitic crusts called [[sabkha]]s. Playa lakes are desert lakes that episodically dry out.

Several different dune types are found in deserts. They can form as crescentic dunes (including barchan dunes), as long linear dunes, or as star dunes with crest lines radiating from one or two central peaks. Different dune types may be superimposed to form complex dunes, whereas the same type of dune is superimposed to form compound dunes. The term draa has been used to refer to large compound or complex dunes.<ref name=Kocurek_1996>Kocurek, G., 1996, Desert eolian systems, in H. G. Reading, ed., Sedimentary environments: Processes, facies and stratigraphy, 3d ed.: Oxford, Blackwell Science, p. 125–153.</ref>

Several different dune types are found in deserts. They can form as crescentic dunes (including barchan dunes), as long linear dunes, or as star dunes with crest lines radiating from one or two central peaks. Different dune types may be superimposed to form complex dunes, whereas the same type of dune is superimposed to form compound dunes. The term draa has been used to refer to large compound or complex dunes.<ref name=Kocurek_1996>Kocurek, G., 1996, Desert eolian systems, in H. G. Reading, ed., Sedimentary environments: Processes, facies and stratigraphy, 3d ed.: Oxford, Blackwell Science, p. 125–153.</ref>