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search   Silt deposits around house and car in New Orleans, left
by flooding from a breach in the London Avenue Canal.    Grain
size criteria[edit]  In the Udden-Wentworth scale (due to
Krumbein), silt particles range between 0.0039 to 0.0625 mm,
larger than clay but smaller than sand particles. ISO 14688
grades silts between 0.002 mm and 0.063 mm. In actuality, silt
is chemically distinct from clay, and unlike clay, grains of
silt are approximately the same size in all dimensions;
furthermore, their size ranges overlap. Clays are formed from
thin plate-shaped particles held together by electrostatic
forces, so present a cohesion. According to the U.S. Department
of Agriculture Soil Texture Classification system, the sand-silt
distinction is made at the 0.05 mm particle size.[7] The USDA
system has been adopted by the Food and Agriculture Organization
(FAO). In the Unified Soil Classification System (USCS) and the
AASHTO Soil Classification system, th