Grain Sizes

Clay – a term of size referring to rock or mineral fragments, of any composition, smaller than 0.004mm; clay is derived through continental weathering and by alteration of a wide range of rock materials

Silt – a term of size referring to rock or mineral fragments, of any composition, between 0.004mm and 0.062mm

Sand – a term of size referring to rock or mineral fragments, of any composition, between 0.062mm and 2mm; in marine environments, sand does not get transported far beyond the continental rise

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Diagram from the University of Texas A&M

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Grain Sizes

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