Changes

==Interdune==

==Interdune==

Interdune areas occur between dunes and bounded by dunes or other eolian deposits such as sand sheets.<ref name=Bggs /> Interdunes may be formed by erosion or deposition. Erosional interdunes are present as disconformity overlain by thin, discontinuous, winnowed lag deposits. All interdunes deposits are characterized by low angle stratification (<~10°). Dry interdunes or interdunes that are wet occasionally are more common than wet interdunes. Dry interdunes have ripple-related wind- transport-processes, grainfall in the wind shadow in the lee of dunes, or sandflow from adjacent dunes. These deposits are coarse, bimodal, poorly sorted, and poorly laminated layers. Wet interdune deposits are finer than the dry interdunes deposits. They are usually in silt or clay size which are trapped by semipermanent bodies of water. This deposits contain freshwater organisms such as pelecypod, gastropod, diatom and ostracod. Evaporite interdunes occur where drying of shallow ephemeral lakes or evaporation of damp surface causes precipitation of carbonate minerals : gypsum or anhydrite. This sediments may be characterized by desiccation cracks, raindrop imprints, , evaporite layers, and pseudomorphs.

Interdune areas occur between dunes and bounded by dunes or other eolian deposits such as sand sheets.<ref name=Bggs /> Interdunes may be formed by erosion or deposition. Erosional interdunes are present as disconformity overlain by thin, discontinuous, winnowed lag deposits. All interdunes deposits are characterized by low angle stratification (<~10°). Dry interdunes or interdunes that are wet occasionally are more common than wet interdunes. Dry interdunes have ripple-related wind- transport-processes, grainfall in the wind shadow in the lee of dunes, or sandflow from adjacent dunes. These deposits are coarse, bimodal, poorly sorted, and poorly laminated layers. Wet interdune deposits are finer than the dry interdunes deposits. They are usually in silt or clay size which are trapped by semipermanent bodies of water. This deposits contain freshwater organisms such as pelecypod, gastropod, diatom and ostracod. [[Evaporite]] interdunes occur where drying of shallow ephemeral lakes or evaporation of damp surface causes precipitation of carbonate minerals : gypsum or anhydrite. This sediments may be characterized by desiccation cracks, raindrop imprints, , evaporite layers, and pseudomorphs.

==Sheet Sands==

==Sheet Sands==