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silt noun [U]. âº âsand or âearth that has been âcarried along by âflowing âwater and then âleft esp. at a âbend in a âriver or at a riverâs âopening. (Definition of silt from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
A siltstone is a mudrock. For a rock to be a siltstone, it must be over fifty percent silt-sized material. Silt is any particle smaller than sand, 1/16 th of a millimeter (~0.06 mm), and larger than clay, 1/256 th (~0.004 mm) of millimeter. Silt is the product of physical weathering, such as freezing and thawing.or a rock to be a siltstone, it must be over fifty percent silt-sized material. Silt is any particle smaller than sand, 1/16 th of a millimeter (~0.06 mm), and larger than clay, 1/256 th (~0.004 mm) of millimeter. Silt is the product of physical weathering, such as freezing and thawing.