Type of deposits	Grain size distribution	Size parameters
Type of deposits	Grain size distribution	Mean	Sorting	Skewness	Kurtosis
Desert deposits
1) Sand sheet
a) Active	Unimodal	Coarse sand	Poorly sorted	Fine skewed	Leptokurtic
b) Rugged vegetated	Unimodal	Coarse sand	Poorly sorted	Strongly fine skewed	Platy-mesokurtic
2) Sand dunes	Unimodal	Medium sand	Moderately well sorted	Fine	Leptokurtic
3) Wadi fill	Unimodal	Coarse sand	Poorly sorted	Symmetrical	Leptokuritc
4) Playa deposits	Unimodal	Coarse sand	Poorly sorted	Coarsely skewed	Leptokurtic
5) Desert plain deposits	Bimodal	Coarse sand	Very poorly sorted	Coarsely skewed	Leptokurtic