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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).
Siltstone is made of sediment that is between sand and clay in the Wentworth grade scale; it's finer grained than sandstone but coarser than shale.Silt is a size term used for material that's smaller than sand (generally 0.1 millimeter) but larger than clay (around 0.004 mm).The silt in this siltstone is unusually pure, containing very little sand or clay.iltstone is made of sediment that is between sand and clay in the Wentworth grade scale; it's finer grained than sandstone but coarser than shale.