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Boulders
256mm+
Cobbles
16-256mm
Pebbles
4-16mm
Granules
2-4mm
very coarse sand
1-2mm
coarse sand
0.5-1mm
medium sand
0.25-0.5mm
fine sand
0.125-0.25mm
very fine sand
0.063-0.125mm
silt
0.0039-0.063mm
clay
≤0.0039mm